diff --git a/assets/images/spectra-th/Ac-225.png b/assets/images/spectra-th/Ac-225.png
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index 0000000..db701d8
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diff --git a/assets/images/spectra-th/Am-241.png b/assets/images/spectra-th/Am-241.png
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diff --git a/assets/images/spectra-th/Ba-131.png b/assets/images/spectra-th/Ba-131.png
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diff --git a/assets/images/spectra-th/Ba-133.png b/assets/images/spectra-th/Ba-133.png
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index 0000000..02dcc83
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diff --git a/assets/images/spectra-th/CeramicPipe.png b/assets/images/spectra-th/CeramicPipe.png
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index 0000000..e2b88be
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diff --git a/assets/images/spectra-th/Co-57.png b/assets/images/spectra-th/Co-57.png
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index 0000000..a7ee32d
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diff --git a/assets/images/spectra-th/Co-60.png b/assets/images/spectra-th/Co-60.png
new file mode 100644
index 0000000..d879513
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diff --git a/assets/images/spectra-th/Cr-51.png b/assets/images/spectra-th/Cr-51.png
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index 0000000..b025aa8
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diff --git a/assets/images/spectra-th/Cs-137.png b/assets/images/spectra-th/Cs-137.png
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index 0000000..55a784c
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diff --git a/assets/images/spectra-th/Er-169.png b/assets/images/spectra-th/Er-169.png
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index 0000000..e091fc3
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diff --git a/assets/images/spectra-th/Eu-152.png b/assets/images/spectra-th/Eu-152.png
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index 0000000..d867e1f
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diff --git a/assets/images/spectra-th/Fiestaware.png b/assets/images/spectra-th/Fiestaware.png
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index 0000000..673cc03
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diff --git a/assets/images/spectra-th/Ge-68_Ga-68.png b/assets/images/spectra-th/Ge-68_Ga-68.png
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index 0000000..271089c
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diff --git a/assets/images/spectra-th/Hg-197m.png b/assets/images/spectra-th/Hg-197m.png
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diff --git a/assets/images/spectra-th/I-124.png b/assets/images/spectra-th/I-124.png
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diff --git a/assets/images/spectra-th/K-40.png b/assets/images/spectra-th/K-40.png
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index 0000000..012953a
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diff --git a/assets/images/spectra-th/La-138.png b/assets/images/spectra-th/La-138.png
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diff --git a/assets/images/spectra-th/Lu-176.png b/assets/images/spectra-th/Lu-176.png
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diff --git a/assets/images/spectra-th/Na-22.png b/assets/images/spectra-th/Na-22.png
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index 0000000..d2c6203
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diff --git a/assets/images/spectra-th/Pb-210.png b/assets/images/spectra-th/Pb-210.png
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diff --git a/assets/images/spectra-th/Pitchblende.png b/assets/images/spectra-th/Pitchblende.png
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diff --git a/assets/images/spectra-th/Ra-226.png b/assets/images/spectra-th/Ra-226.png
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index 0000000..ad8b6ea
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diff --git a/assets/images/spectra-th/RadiumDial.png b/assets/images/spectra-th/RadiumDial.png
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index 0000000..663bc27
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diff --git a/assets/images/spectra-th/Re-186.png b/assets/images/spectra-th/Re-186.png
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index 0000000..53d4f16
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diff --git a/assets/images/spectra-th/Sm-153.png b/assets/images/spectra-th/Sm-153.png
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index 0000000..723c1bd
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diff --git a/assets/images/spectra-th/Tc-99m.png b/assets/images/spectra-th/Tc-99m.png
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index 0000000..53a992f
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diff --git a/assets/images/spectra-th/ThoriumSource.png b/assets/images/spectra-th/ThoriumSource.png
new file mode 100644
index 0000000..d5f69a4
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diff --git a/assets/images/spectra-th/Uranium-glaze.png b/assets/images/spectra-th/Uranium-glaze.png
new file mode 100644
index 0000000..8d573c3
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diff --git a/assets/images/spectra-th/Zeunerite.png b/assets/images/spectra-th/Zeunerite.png
new file mode 100644
index 0000000..f0ec65e
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diff --git a/collections/_spectrum/Ac-225.md b/collections/_spectrum/Ac-225.md
index 72b6acd..dfb8fb1 100644
--- a/collections/_spectrum/Ac-225.md
+++ b/collections/_spectrum/Ac-225.md
@@ -1,9 +1,9 @@
 ---
 title: Actinium-225
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Ac-225.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Actinium-225 (<sup>225</sup>Ac, Ac-225) is an isotope of actinium. It undergoes alpha decay to francium-221 with a half-life of 10 days, and is an intermediate decay product in the neptunium series (the decay chain starting at <sup>237</sup>Np). Except for minuscule quantities arising from this decay chain in nature, <sup>225</sup>Ac is entirely synthetic.
@@ -17,14 +17,13 @@ The decay properties of actinium-225 are favorable for usage in targeted alpha t
 
 ### Metadata
 
-| Isotope: | Actinium |
-| --- | --- |
-| Mass number: | 225 |
-| Atomic number: | 89 |
-| Neutron number: | 136 |
-| ... | ... |
+| Isotope:        | Actinium |
+| --------------- | -------- |
+| Mass number:    | 225      |
+| Atomic number:  | 89       |
+| Neutron number: | 136      |
+| ...             | ...      |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Actinium-225](https://en.wikipedia.org/wiki/Actinium-225)
-
diff --git a/collections/_spectrum/Am-241.md b/collections/_spectrum/Am-241.md
index 68560fe..d258db4 100644
--- a/collections/_spectrum/Am-241.md
+++ b/collections/_spectrum/Am-241.md
@@ -1,9 +1,9 @@
 ---
 title: Americium-241
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Am-241.png
 #date: 2022-06-09 15:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Americium-241 is an isotope of americium. Like all isotopes of americium, it is radioactive, with a half-life of 432.2 years. <sup>241</sup>Am is the most common isotope of americium as well as the most prevalent isotope of americium in nuclear waste. It is commonly found in ionization type smoke detectors and is a potential fuel for long-lifetime radioisotope thermoelectric generators (RTGs).
@@ -15,12 +15,12 @@ Americium-241 is an isotope of americium. Like all isotopes of americium, it is
 
 ### Metadata
 
-| Isotope: | Americium |
-| --- | --- |
-| Mass number: | 241 |
-| Atomic number: | 95 |
-| Neutron number: | 146 |
-| ... | ... |
+| Isotope:        | Americium |
+| --------------- | --------- |
+| Mass number:    | 241       |
+| Atomic number:  | 95        |
+| Neutron number: | 146       |
+| ...             | ...       |
 
 ### Sources and Further Read
 
diff --git a/collections/_spectrum/Ba-131.md b/collections/_spectrum/Ba-131.md
index d89969f..a50105a 100644
--- a/collections/_spectrum/Ba-131.md
+++ b/collections/_spectrum/Ba-131.md
@@ -1,9 +1,9 @@
 ---
 title: Barium-131
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Ba-131.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Naturally occurring barium (<sub>56</sub>Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001. There are a total of thirty-three known radioisotopes in addition to <sup>130</sup>Ba. The longest-lived of these is <sup>133</sup>Ba, which has a half-life of 10.51 years. All other radioisotopes have half-lives shorter than two weeks. The longest-lived isomer is <sup>133m</sup>Ba, which has a half-life of 38.9 hours.
@@ -17,15 +17,14 @@ Of the stable isotopes, barium-138 composes 71.7% of all barium; other isotopes
 
 ### Metadata
 
-| Isotope: | Barium |
-| --- | --- |
-| Mass number: | 131 |
-| Atomic number: | 56 |
-| Neutron number: | 75 |
-| ... | ... |
+| Isotope:        | Barium |
+| --------------- | ------ |
+| Mass number:    | 131    |
+| Atomic number:  | 56     |
+| Neutron number: | 75     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Barium](https://en.wikipedia.org/wiki/Barium)
 - [https://en.wikipedia.org/wiki/Isotopes_of_barium](https://en.wikipedia.org/wiki/Isotopes_of_barium)
-
diff --git a/collections/_spectrum/Ba-133.md b/collections/_spectrum/Ba-133.md
index c4e0770..ec8f525 100644
--- a/collections/_spectrum/Ba-133.md
+++ b/collections/_spectrum/Ba-133.md
@@ -1,9 +1,9 @@
 ---
 title: Barium-133
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Ba-133.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Naturally occurring barium (<sub>56</sub>Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001. There are a total of thirty-three known radioisotopes in addition to <sup>130</sup>Ba. The longest-lived of these is <sup>133</sup>Ba, which has a half-life of 10.51 years. All other radioisotopes have half-lives shorter than two weeks. The longest-lived isomer is <sup>133m</sup>Ba, which has a half-life of 38.9 hours.
@@ -17,15 +17,14 @@ Of the stable isotopes, barium-138 composes 71.7% of all barium; other isotopes
 
 ### Metadata
 
-| Isotope: | Barium |
-| --- | --- |
-| Mass number: | 133 |
-| Atomic number: | 56 |
-| Neutron number: | 77 |
-| ... | ... |
+| Isotope:        | Barium |
+| --------------- | ------ |
+| Mass number:    | 133    |
+| Atomic number:  | 56     |
+| Neutron number: | 77     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Barium](https://en.wikipedia.org/wiki/Barium)
 - [https://en.wikipedia.org/wiki/Isotopes_of_barium](https://en.wikipedia.org/wiki/Isotopes_of_barium)
-
diff --git a/collections/_spectrum/CeramicPipe.md b/collections/_spectrum/CeramicPipe.md
index a4e096b..43ac10d 100644
--- a/collections/_spectrum/CeramicPipe.md
+++ b/collections/_spectrum/CeramicPipe.md
@@ -1,12 +1,12 @@
 ---
 title: Ceramic Pipe
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/CeramicPipe.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-08 15:30:00 +0200
-
 ---
 
-Parts of a ceramic drainage pipe from a house from the 1820s (roughly). Clearly shows traces of uranium and thorium, which would be used in the glaze. Somewhat similar to the uranium glaze spectrum, but an earlier version without filtering out all the other nuclides except for the uranium -- therefore likely used raw Pitchblende (compare spectrum). 
+Parts of a ceramic drainage pipe from a house from the 1820s (roughly). Clearly shows traces of uranium and thorium, which would be used in the glaze. Somewhat similar to the uranium glaze spectrum, but an earlier version without filtering out all the other nuclides except for the uranium -- therefore likely used raw Pitchblende (compare spectrum).
 
 ### Spectrum ([Fullscreen](/assets/spectra/CeramicPipe1820.html))
 
@@ -15,15 +15,14 @@ Parts of a ceramic drainage pipe from a house from the 1820s (roughly). Clearly
 
 ### Metadata
 
-| Isotope: | --- |
-| --- | --- |
-| Mass number: | --- |
-| Atomic number: | --- |
+| Isotope:        | --- |
+| --------------- | --- |
+| Mass number:    | --- |
+| Atomic number:  | --- |
 | Neutron number: | --- |
-| ... | ... |
+| ...             | ... |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Uranium_tile](https://en.wikipedia.org/wiki/Uranium_tile)
 - [https://en.wikipedia.org/wiki/Uraninite](https://en.wikipedia.org/wiki/Uraninite)
-
diff --git a/collections/_spectrum/Co-57.md b/collections/_spectrum/Co-57.md
index eb390fb..686aa02 100644
--- a/collections/_spectrum/Co-57.md
+++ b/collections/_spectrum/Co-57.md
@@ -1,14 +1,14 @@
 ---
 title: Cobalt-57
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Co-57.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 <sup>59</sup>Co is the only stable cobalt isotope and the only isotope that exists naturally on Earth. Twenty-two radioisotopes have been characterized: the most stable, <sup>60</sup>Co, has a half-life of 5.2714 years; <sup>57</sup>Co has a half-life of 271.8 days; <sup>56</sup>Co has a half-life of 77.27 days; and <sup>58</sup>Co has a half-life of 70.86 days. All the other radioactive isotopes of cobalt have half-lives shorter than 18 hours, and in most cases shorter than 1 second.
 
-Cobalt-57 is used as a source in Mössbauer spectroscopy of iron-containing samples. Electron capture by <sup>57</sup>Co forms an excited state of the <sup>57</sup>Fe nucleus, which in turn decays to the ground state with emission of a gamma ray. Measurement of the gamma ray spectrum provides information about the chemical state of the iron atom in the sample. 
+Cobalt-57 is used as a source in Mössbauer spectroscopy of iron-containing samples. Electron capture by <sup>57</sup>Co forms an excited state of the <sup>57</sup>Fe nucleus, which in turn decays to the ground state with emission of a gamma ray. Measurement of the gamma ray spectrum provides information about the chemical state of the iron atom in the sample.
 
 Cobalt-57 is also used in medical tests; it is used as a radiolabel for vitamin B12 uptake.
 
@@ -19,15 +19,14 @@ Cobalt-57 is also used in medical tests; it is used as a radiolabel for vitamin
 
 ### Metadata
 
-| Isotope: | Cobalt |
-| --- | --- |
-| Mass number: | 57 |
-| Atomic number: | 27 |
-| Neutron number: | 30 |
-| ... | ... |
+| Isotope:        | Cobalt |
+| --------------- | ------ |
+| Mass number:    | 57     |
+| Atomic number:  | 27     |
+| Neutron number: | 30     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Cobalt](https://en.wikipedia.org/wiki/Cobalt)
 - [https://en.wikipedia.org/wiki/Isotopes_of_cobalt](https://en.wikipedia.org/wiki/Isotopes_of_cobalt)
-
diff --git a/collections/_spectrum/Co-60.md b/collections/_spectrum/Co-60.md
index ee2e724..44b8734 100644
--- a/collections/_spectrum/Co-60.md
+++ b/collections/_spectrum/Co-60.md
@@ -1,9 +1,9 @@
 ---
 title: Cobalt-60
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Co-60.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 <sup>59</sup>Co is the only stable cobalt isotope and the only isotope that exists naturally on Earth. Twenty-two radioisotopes have been characterized: the most stable, <sup>60</sup>Co, has a half-life of 5.2714 years; <sup>57</sup>Co has a half-life of 271.8 days; <sup>56</sup>Co has a half-life of 77.27 days; and <sup>58</sup>Co has a half-life of 70.86 days. All the other radioactive isotopes of cobalt have half-lives shorter than 18 hours, and in most cases shorter than 1 second.
@@ -25,15 +25,14 @@ Cobalt-60 is useful as a gamma ray source because it can be produced in predicta
 
 ### Metadata
 
-| Isotope: | Cobalt |
-| --- | --- |
-| Mass number: | 60 |
-| Atomic number: | 27 |
-| Neutron number: | 33 |
-| ... | ... |
+| Isotope:        | Cobalt |
+| --------------- | ------ |
+| Mass number:    | 60     |
+| Atomic number:  | 27     |
+| Neutron number: | 33     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Cobalt](https://en.wikipedia.org/wiki/Cobalt)
 - [https://en.wikipedia.org/wiki/Isotopes_of_cobalt](https://en.wikipedia.org/wiki/Isotopes_of_cobalt)
-
diff --git a/collections/_spectrum/Cr-51.md b/collections/_spectrum/Cr-51.md
index 2470d58..8750d80 100644
--- a/collections/_spectrum/Cr-51.md
+++ b/collections/_spectrum/Cr-51.md
@@ -1,9 +1,9 @@
 ---
 title: Chromium-51
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Cr-51.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Naturally occurring chromium (<sub>24</sub>Cr) is composed of four stable isotopes; <sup>50</sup>Cr, <sup>52</sup>Cr, <sup>53</sup>Cr, and <sup>54</sup>Cr with <sup>52</sup>Cr being the most abundant (83.789% natural abundance). <sup>50</sup>Cr is suspected of decaying by β<sup>+</sup>β<sup>+</sup> to <sup>50</sup>Ti with a half-life of (more than) 1.8×10<sup>17</sup> years. Twenty-two radioisotopes, all of which are entirely synthetic, have been characterized with the most stable being <sup>51</sup>Cr with a half-life of 27.7 days. All of the remaining radioactive isotopes have half-lives that are less than 24 hours.
@@ -17,15 +17,14 @@ Chromium-51 is a manmade isotope of chromium used in medicine as a radioisotopic
 
 ### Metadata
 
-| Isotope: | Chromium |
-| --- | --- |
-| Mass number: | 51 |
-| Atomic number: | 24 |
-| Neutron number: | 27 |
-| ... | ... |
+| Isotope:        | Chromium |
+| --------------- | -------- |
+| Mass number:    | 51       |
+| Atomic number:  | 24       |
+| Neutron number: | 27       |
+| ...             | ...      |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Chromium#Isotopes](https://en.wikipedia.org/wiki/Chromium#Isotopes)
 - [https://en.wikipedia.org/wiki/Isotopes_of_chromium](https://en.wikipedia.org/wiki/Isotopes_of_chromium)
-
diff --git a/collections/_spectrum/Cs-137.md b/collections/_spectrum/Cs-137.md
index c952087..cb06fcb 100644
--- a/collections/_spectrum/Cs-137.md
+++ b/collections/_spectrum/Cs-137.md
@@ -1,9 +1,9 @@
 ---
 title: Caesium-137
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Cs-137.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Caesium-137 is a radioactive isotope of caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons. Trace quantities also originate from spontaneous fission of uranium-238. It is among the most problematic of the short-to-medium-lifetime fission products. Caesium-137 has a relatively low boiling point of 671 °C (1,240 °F) and is volatilized easily when released suddenly at high temperature, as in the case of the Chernobyl nuclear accident and with atomic explosions, and can travel very long distances in the air. After being deposited onto the soil as radioactive fallout, it moves and spreads easily in the environment because of the high water solubility of caesium's most common chemical compounds, which are salts.
@@ -15,16 +15,15 @@ Caesium-137 is a radioactive isotope of caesium that is formed as one of the mor
 
 ### Metadata
 
-| Isotope: | Caesium |
-| --- | --- |
-| Mass number: | 137 |
-| Atomic number: | 55 |
-| Neutron number: | 82 |
-| ... | ... |
+| Isotope:        | Caesium |
+| --------------- | ------- |
+| Mass number:    | 137     |
+| Atomic number:  | 55      |
+| Neutron number: | 82      |
+| ...             | ...     |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Caesium](https://en.wikipedia.org/wiki/Caesium)
 - [https://en.wikipedia.org/wiki/Isotopes_of_caesium](https://en.wikipedia.org/wiki/Isotopes_of_caesium)
 - [https://en.wikipedia.org/wiki/Caesium-137](https://en.wikipedia.org/wiki/Caesium-137)
-
diff --git a/collections/_spectrum/Er-169.md b/collections/_spectrum/Er-169.md
index 70924db..c9c8e01 100644
--- a/collections/_spectrum/Er-169.md
+++ b/collections/_spectrum/Er-169.md
@@ -1,9 +1,9 @@
 ---
 title: Erbium-169
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Er-169.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Naturally occurring erbium (<sub>68</sub>Er) is composed of 6 stable isotopes, with <sup>166</sup>Er being the most abundant (33.503% natural abundance). 39 radioisotopes have been characterized with between 74 and 112 neutrons, or 142 to 180 nucleons, with the most stable being <sup>169</sup>Er with a half-life of 9.4 days. It is used as a radiopharmaceutical. All of the remaining radioactive isotopes have half-lives that are less than 3.5 hours, and the majority of these have half-lives that are less than 4 minutes.
@@ -15,14 +15,13 @@ Naturally occurring erbium (<sub>68</sub>Er) is composed of 6 stable isotopes, w
 
 ### Metadata
 
-| Isotope: | Erbium |
-| --- | --- |
-| Mass number: | 169 |
-| Atomic number: | 68 |
-| Neutron number: | 101 |
-| ... | ... |
+| Isotope:        | Erbium |
+| --------------- | ------ |
+| Mass number:    | 169    |
+| Atomic number:  | 68     |
+| Neutron number: | 101    |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Isotopes_of_erbium](https://en.wikipedia.org/wiki/Isotopes_of_erbium)
-
diff --git a/collections/_spectrum/Eu-152.md b/collections/_spectrum/Eu-152.md
index 655db98..d477c42 100644
--- a/collections/_spectrum/Eu-152.md
+++ b/collections/_spectrum/Eu-152.md
@@ -1,9 +1,9 @@
 ---
 title: Europium-152
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Eu-152.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Naturally occurring europium (<sub>63</sub>Eu) is composed of 2 isotopes, <sup>151</sup>Eu and <sup>153</sup>Eu, with <sup>153</sup>Eu being the most abundant (52.2% natural abundance). While <sup>153</sup>Eu is observationally stable, <sup>151</sup>Eu was found in 2007 to be unstable and undergo alpha decay.
@@ -17,15 +17,14 @@ Besides the natural radioisotope <sup>151</sup>Eu, 36 artificial radioisotopes h
 
 ### Metadata
 
-| Isotope: | Europium |
-| --- | --- |
-| Mass number: | 152 |
-| Atomic number: | 63 |
-| Neutron number: | 89 |
-| ... | ... |
+| Isotope:        | Europium |
+| --------------- | -------- |
+| Mass number:    | 152      |
+| Atomic number:  | 63       |
+| Neutron number: | 89       |
+| ...             | ...      |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Europium](https://en.wikipedia.org/wiki/Europium)
 - [https://en.wikipedia.org/wiki/Isotopes_of_europium](https://en.wikipedia.org/wiki/Isotopes_of_europium)
-
diff --git a/collections/_spectrum/Fiestaware.md b/collections/_spectrum/Fiestaware.md
index b55b42a..d3d78bd 100644
--- a/collections/_spectrum/Fiestaware.md
+++ b/collections/_spectrum/Fiestaware.md
@@ -1,9 +1,9 @@
 ---
 title: Fiestaware
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Fiestaware.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Brilliant red Fiesta (and indeed the red glazes produced by all U.S. potteries of the era) is known for having a detectable amount of uranium oxide in its glaze, which produced the orange-red color. During World War II, the government took control of uranium for development of the atom bomb, and confiscated the company's stocks. Homer Laughlin discontinued Fiesta red in 1944. The company reintroduced Fiesta red in 1959 using depleted uranium (rather than the original natural uranium), after the Atomic Energy Commission relaxed its restrictions on uranium oxide. In addition to pottery glazing, uranium oxide was used even more extensively in the tiling industry, producing uranium tile.
@@ -15,14 +15,13 @@ Brilliant red Fiesta (and indeed the red glazes produced by all U.S. potteries o
 
 ### Metadata
 
-| Isotope: | --- |
-| --- | --- |
-| Mass number: | --- |
-| Atomic number: | --- |
+| Isotope:        | --- |
+| --------------- | --- |
+| Mass number:    | --- |
+| Atomic number:  | --- |
 | Neutron number: | --- |
-| ... | ... |
+| ...             | ... |
 
 ### Sources and Further Read
 
-- [https://en.wikipedia.org/wiki/Fiesta_(dinnerware)#Radioactive_glazes](https://en.wikipedia.org/wiki/Fiesta_(dinnerware)#Radioactive_glazes)
-
+- [https://en.wikipedia.org/wiki/Fiesta\_(dinnerware)#Radioactive_glazes](<https://en.wikipedia.org/wiki/Fiesta_(dinnerware)#Radioactive_glazes>)
diff --git a/collections/_spectrum/Ge-68_Ga-68.md b/collections/_spectrum/Ge-68_Ga-68.md
index 1282739..4b841be 100644
--- a/collections/_spectrum/Ge-68_Ga-68.md
+++ b/collections/_spectrum/Ge-68_Ga-68.md
@@ -1,9 +1,9 @@
 ---
 title: Germanium-68/Gallium-68
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Ge-68_Ga-68.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-08 13:45:00 +0200
-
 ---
 
 A germanium-68/gallium-68 generator is a device used to extract the positron-emitting isotope <sup>68</sup>Ga of gallium from a source of decaying germanium-68. The parent isotope <sup>68</sup>Ge has a half-life of 271 days and can be easily utilized for in-hospital production of generator produced <sup>68</sup>Ga. Its decay product gallium-68 (with a half-life of only 68 minutes, inconvenient for transport) is extracted and used for certain positron emission tomography nuclear medicine diagnostic procedures, where the radioisotope's relatively short half-life and emission of positrons for creation of 3-dimensional PET scans, are useful.
@@ -17,23 +17,22 @@ This is not actually a gamma emitter. Since it is used most commonly in PET scan
 
 ### Metadata
 
-| Isotope: | Germanium |
-| --- | --- |
-| Mass number: | 68 |
-| Atomic number: | 32 |
-| Neutron number: | 36 |
-| ... | ... |
+| Isotope:        | Germanium |
+| --------------- | --------- |
+| Mass number:    | 68        |
+| Atomic number:  | 32        |
+| Neutron number: | 36        |
+| ...             | ...       |
 
-| Isotope: | Gallium |
-| --- | --- |
-| Mass number: | 68 |
-| Atomic number: | 31 |
-| Neutron number: | 37 |
-| ... | ... |
+| Isotope:        | Gallium |
+| --------------- | ------- |
+| Mass number:    | 68      |
+| Atomic number:  | 31      |
+| Neutron number: | 37      |
+| ...             | ...     |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Gallium-68_generator](https://en.wikipedia.org/wiki/Gallium-68_generator)
 - [https://en.wikipedia.org/wiki/Isotopes_of_germanium](https://en.wikipedia.org/wiki/Isotopes_of_germanium)
 - [https://en.wikipedia.org/wiki/Isotopes_of_gallium#Gallium-68](https://en.wikipedia.org/wiki/Isotopes_of_gallium#Gallium-68)
-
diff --git a/collections/_spectrum/Hg-197m.md b/collections/_spectrum/Hg-197m.md
index 21e46c9..c9a2766 100644
--- a/collections/_spectrum/Hg-197m.md
+++ b/collections/_spectrum/Hg-197m.md
@@ -1,14 +1,14 @@
 ---
 title: Mercury-197m
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Hg-197m.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 There are seven stable isotopes of mercury, with <sup>202</sup>Hg being the most abundant (29.86%). The longest-lived radioisotopes are <sup>194</sup>Hg with a half-life of 444 years, and <sup>203</sup>Hg with a half-life of 46.612 days. Most of the remaining radioisotopes have half-lives that are less than a day.
 
-For the synthesis of precious metals two stable mercury isotopes are of potential interest - the trace isotope <sup>196</sup>Hg and the more abundant <sup>198</sup>Hg. Both are "one neutron removed" from <sup>197</sup>Hg, a radioisotope which decays to <sup>197</sup>Au, the only known stable isotope of gold. 
+For the synthesis of precious metals two stable mercury isotopes are of potential interest - the trace isotope <sup>196</sup>Hg and the more abundant <sup>198</sup>Hg. Both are "one neutron removed" from <sup>197</sup>Hg, a radioisotope which decays to <sup>197</sup>Au, the only known stable isotope of gold.
 
 ### Spectrum ([Fullscreen](/assets/spectra/Hg-197m.html))
 
@@ -17,15 +17,14 @@ For the synthesis of precious metals two stable mercury isotopes are of potentia
 
 ### Metadata
 
-| Isotope: | Mercury |
-| --- | --- |
-| Mass number: | 197 |
-| Atomic number: | 80 |
-| Neutron number: | 117 |
-| ... | ... |
+| Isotope:        | Mercury |
+| --------------- | ------- |
+| Mass number:    | 197     |
+| Atomic number:  | 80      |
+| Neutron number: | 117     |
+| ...             | ...     |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Isotopes_of_mercury](https://en.wikipedia.org/wiki/Isotopes_of_mercury)
-- [https://en.wikipedia.org/wiki/Mercury_(element)#Isotopes](https://en.wikipedia.org/wiki/Mercury_(element)#Isotopes)
-
+- [https://en.wikipedia.org/wiki/Mercury\_(element)#Isotopes](<https://en.wikipedia.org/wiki/Mercury_(element)#Isotopes>)
diff --git a/collections/_spectrum/I-124.md b/collections/_spectrum/I-124.md
index 0938098..90faeea 100644
--- a/collections/_spectrum/I-124.md
+++ b/collections/_spectrum/I-124.md
@@ -1,9 +1,9 @@
 ---
 title: Iodine-124
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/I-124.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Of the thirty-seven known isotopes of iodine, only one occurs in nature, iodine-127. The others are radioactive and have half-lives too short to be primordial. As such, iodine is both monoisotopic and mononuclidic and its atomic weight is known to great precision, as it is a constant of nature.
@@ -19,15 +19,14 @@ Iodine-124 as the iodide salt can be used to directly image the thyroid using po
 
 ### Metadata
 
-| Isotope: | Iodine |
-| --- | --- |
-| Mass number: | 124 |
-| Atomic number: | 53 |
-| Neutron number: | 71 |
-| ... | ... |
+| Isotope:        | Iodine |
+| --------------- | ------ |
+| Mass number:    | 124    |
+| Atomic number:  | 53     |
+| Neutron number: | 71     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Iodine](https://en.wikipedia.org/wiki/Iodine)
 - [https://en.wikipedia.org/wiki/Isotopes_of_iodine](https://en.wikipedia.org/wiki/Isotopes_of_iodine)
-
diff --git a/collections/_spectrum/I-125.md b/collections/_spectrum/I-125.md
index 48216eb..a30f026 100644
--- a/collections/_spectrum/I-125.md
+++ b/collections/_spectrum/I-125.md
@@ -1,9 +1,9 @@
 ---
 title: Iodine-125
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/I-125.png
 #date: 2022-06-06 21:00:00 +0200
 last_modified_at: 2023-07-07 22:30:00 +0200
-
 ---
 
 Of the thirty-seven known isotopes of iodine, only one occurs in nature, iodine-127. The others are radioactive and have half-lives too short to be primordial. As such, iodine is both monoisotopic and mononuclidic and its atomic weight is known to great precision, as it is a constant of nature.
@@ -19,15 +19,14 @@ The gamma-emitting isotopes iodine-123 (half-life 13 hours), and (less commonly)
 
 ### Metadata
 
-| Isotope: | Iodine |
-| --- | --- |
-| Mass number: | 125 |
-| Atomic number: | 53 |
-| Neutron number: | 72 |
-| ... | ... |
+| Isotope:        | Iodine |
+| --------------- | ------ |
+| Mass number:    | 125    |
+| Atomic number:  | 53     |
+| Neutron number: | 72     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Iodine](https://en.wikipedia.org/wiki/Iodine)
 - [https://en.wikipedia.org/wiki/Isotopes_of_iodine](https://en.wikipedia.org/wiki/Isotopes_of_iodine)
-
diff --git a/collections/_spectrum/I-131.md b/collections/_spectrum/I-131.md
index da2f060..a060493 100644
--- a/collections/_spectrum/I-131.md
+++ b/collections/_spectrum/I-131.md
@@ -1,14 +1,14 @@
 ---
 title: Iodine-131
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/I-131.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Of the thirty-seven known isotopes of iodine, only one occurs in nature, iodine-127. The others are radioactive and have half-lives too short to be primordial. As such, iodine is both monoisotopic and mononuclidic and its atomic weight is known to great precision, as it is a constant of nature.
 
-Iodine-131 (<sup>131</sup>I) is a beta-emitting isotope with a half-life of eight days, and comparatively energetic (190 keV average and 606 keV maximum energy) beta radiation, which penetrates 0.6 to 2.0 mm from the site of uptake. This beta radiation can be used for the destruction of thyroid nodules or hyperfunctioning thyroid tissue and for elimination of remaining thyroid tissue after surgery for the treatment of Graves' disease. The purpose of this therapy, which was first explored by Dr. Saul Hertz in 1941, is to destroy thyroid tissue that could not be removed surgically. In this procedure, <sup>131</sup>I is administered either intravenously or orally following a diagnostic scan. This procedure may also be used, with higher doses of radio-iodine, to treat patients with thyroid cancer. 
+Iodine-131 (<sup>131</sup>I) is a beta-emitting isotope with a half-life of eight days, and comparatively energetic (190 keV average and 606 keV maximum energy) beta radiation, which penetrates 0.6 to 2.0 mm from the site of uptake. This beta radiation can be used for the destruction of thyroid nodules or hyperfunctioning thyroid tissue and for elimination of remaining thyroid tissue after surgery for the treatment of Graves' disease. The purpose of this therapy, which was first explored by Dr. Saul Hertz in 1941, is to destroy thyroid tissue that could not be removed surgically. In this procedure, <sup>131</sup>I is administered either intravenously or orally following a diagnostic scan. This procedure may also be used, with higher doses of radio-iodine, to treat patients with thyroid cancer.
 
 ### Spectrum ([Fullscreen](/assets/spectra/I-131.html))
 
@@ -17,15 +17,14 @@ Iodine-131 (<sup>131</sup>I) is a beta-emitting isotope with a half-life of eigh
 
 ### Metadata
 
-| Isotope: | Iodine |
-| --- | --- |
-| Mass number: | 131 |
-| Atomic number: | 53 |
-| Neutron number: | 78 |
-| ... | ... |
+| Isotope:        | Iodine |
+| --------------- | ------ |
+| Mass number:    | 131    |
+| Atomic number:  | 53     |
+| Neutron number: | 78     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Iodine](https://en.wikipedia.org/wiki/Iodine)
 - [https://en.wikipedia.org/wiki/Isotopes_of_iodine](https://en.wikipedia.org/wiki/Isotopes_of_iodine)
-
diff --git a/collections/_spectrum/K-40.md b/collections/_spectrum/K-40.md
index 01b1cf5..4fb0dc7 100644
--- a/collections/_spectrum/K-40.md
+++ b/collections/_spectrum/K-40.md
@@ -1,9 +1,9 @@
 ---
 title: Potassium-40
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/K-40.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Potassium-40 (<sup>40</sup>K) is a radioactive isotope of potassium which has a long half-life of 1.25 billion years. It makes up about 0.012% (120 ppm) of the total amount of potassium found in nature.
@@ -17,15 +17,14 @@ Potassium-40 is a rare example of a nuclide that undergoes both types of beta de
 
 ### Metadata
 
-| Isotope: | Potassium |
-| --- | --- |
-| Mass number: | 40 |
-| Atomic number: | 19 |
-| Neutron number: | 21 |
-| ... | ... |
+| Isotope:        | Potassium |
+| --------------- | --------- |
+| Mass number:    | 40        |
+| Atomic number:  | 19        |
+| Neutron number: | 21        |
+| ...             | ...       |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Potassium](https://en.wikipedia.org/wiki/Potassium)
 - [https://en.wikipedia.org/wiki/Potassium-40](https://en.wikipedia.org/wiki/Potassium-40)
-
diff --git a/collections/_spectrum/La-138.md b/collections/_spectrum/La-138.md
index 15abcf6..00a9229 100644
--- a/collections/_spectrum/La-138.md
+++ b/collections/_spectrum/La-138.md
@@ -1,9 +1,9 @@
 ---
 title: Lanthanum-138
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/La-138.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-08 13:45:00 +0200
-
 ---
 
 Naturally occurring lanthanum (<sub>57</sub>La) is composed of one stable (<sup>139</sup>La) and one radioactive (<sup>138</sup>La) isotope, with the stable isotope, <sup>139</sup>La, being the most abundant (99.91% natural abundance). There are 38 radioisotopes that have been characterized, with the most stable being <sup>138</sup>La, with a half-life of 1.02×10<sup>11</sup> years; <sup>137</sup>La, with a half-life of 60,000 years and <sup>140</sup>La, with a half-life of 1.6781 days. The remaining radioactive isotopes have half-lives that are less than a day and the majority of these have half-lives that are less than 1 minute.
@@ -16,16 +16,15 @@ Spectrum of a sample of La-(III)-oxide. 5 minute measurement with a High Purity
 
 ### Metadata
 
-| Isotope: | Lanthanum |
-| --- | --- |
-| Mass number: | 138 |
-| Atomic number: | 57 |
-| Neutron number: | 81 |
-| ... | ... |
+| Isotope:        | Lanthanum |
+| --------------- | --------- |
+| Mass number:    | 138       |
+| Atomic number:  | 57        |
+| Neutron number: | 81        |
+| ...             | ...       |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Lanthanum#Isotopes](https://en.wikipedia.org/wiki/Lanthanum#Isotopes)
 - [https://en.wikipedia.org/wiki/Lanthanum_oxide](https://en.wikipedia.org/wiki/Lanthanum_oxide)
 - [https://en.wikipedia.org/wiki/Isotopes_of_lanthanum](https://en.wikipedia.org/wiki/Isotopes_of_lanthanum)
-
diff --git a/collections/_spectrum/Lu-176.md b/collections/_spectrum/Lu-176.md
index 1960fb4..e105369 100644
--- a/collections/_spectrum/Lu-176.md
+++ b/collections/_spectrum/Lu-176.md
@@ -1,12 +1,12 @@
 ---
 title: Lutetium-176
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Lu-176.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
-Naturally occurring lutetium (<sub>71</sub>Lu) is composed of one stable isotope <sup>175</sup>Lu (97.41% natural abundance) and one long-lived radioisotope, <sup>176</sup>Lu with a half-life of 3.78 × 10<sup>10</sup> years (2.59% natural abundance). Thirty-five radioisotopes have been characterized, with the most stable, besides <sup>176</sup>Lu, being <sup>174</sup>Lu with a half-life of 3.31 years, and <sup>173</sup>Lu with a half-life of 1.37 years. All of the remaining radioactive isotopes have half-lives that are less than 9 days, and the majority of these have half-lives that are less than half an hour. This element also has 18 meta states, with the most stable being <sup>177m</sup>Lu (t<sub>1/2</sub> 160.4 days), <sup>174m</sup>Lu (t<sub>1/2</sub> 142 days) and <sup>178m</sup>Lu (t<sub>1/2</sub> 23.1 minutes). 
+Naturally occurring lutetium (<sub>71</sub>Lu) is composed of one stable isotope <sup>175</sup>Lu (97.41% natural abundance) and one long-lived radioisotope, <sup>176</sup>Lu with a half-life of 3.78 × 10<sup>10</sup> years (2.59% natural abundance). Thirty-five radioisotopes have been characterized, with the most stable, besides <sup>176</sup>Lu, being <sup>174</sup>Lu with a half-life of 3.31 years, and <sup>173</sup>Lu with a half-life of 1.37 years. All of the remaining radioactive isotopes have half-lives that are less than 9 days, and the majority of these have half-lives that are less than half an hour. This element also has 18 meta states, with the most stable being <sup>177m</sup>Lu (t<sub>1/2</sub> 160.4 days), <sup>174m</sup>Lu (t<sub>1/2</sub> 142 days) and <sup>178m</sup>Lu (t<sub>1/2</sub> 23.1 minutes).
 
 ### Spectrum ([Fullscreen](/assets/spectra/Lu-176.html))
 
@@ -15,15 +15,14 @@ Naturally occurring lutetium (<sub>71</sub>Lu) is composed of one stable isotope
 
 ### Metadata
 
-| Isotope: | Lutetium |
-| --- | --- |
-| Mass number: | 176 |
-| Atomic number: | 71 |
-| Neutron number: | 105 |
-| ... | ... |
+| Isotope:        | Lutetium |
+| --------------- | -------- |
+| Mass number:    | 176      |
+| Atomic number:  | 71       |
+| Neutron number: | 105      |
+| ...             | ...      |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Lutetium#Isotopes](https://en.wikipedia.org/wiki/Lutetium#Isotopes)
 - [https://en.wikipedia.org/wiki/Isotopes_of_lutetium](https://en.wikipedia.org/wiki/Isotopes_of_lutetium)
-
diff --git a/collections/_spectrum/Lu-177.md b/collections/_spectrum/Lu-177.md
index ee9e1df..6e8b0f3 100644
--- a/collections/_spectrum/Lu-177.md
+++ b/collections/_spectrum/Lu-177.md
@@ -1,12 +1,12 @@
 ---
 title: Lutetium-177(m)
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Lu-177.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
-Naturally occurring lutetium (<sub>71</sub>Lu) is composed of one stable isotope <sup>175</sup>Lu (97.41% natural abundance) and one long-lived radioisotope, <sup>176</sup>Lu with a half-life of 3.78 × 10<sup>10</sup> years (2.59% natural abundance). Thirty-five radioisotopes have been characterized, with the most stable, besides <sup>176</sup>Lu, being <sup>174</sup>Lu with a half-life of 3.31 years, and <sup>173</sup>Lu with a half-life of 1.37 years. All of the remaining radioactive isotopes have half-lives that are less than 9 days, and the majority of these have half-lives that are less than half an hour. This element also has 18 meta states, with the most stable being <sup>177m</sup>Lu (t<sub>1/2</sub> 160.4 days), <sup>174m</sup>Lu (t<sub>1/2</sub> 142 days) and <sup>178m</sup>Lu (t<sub>1/2</sub> 23.1 minutes). 
+Naturally occurring lutetium (<sub>71</sub>Lu) is composed of one stable isotope <sup>175</sup>Lu (97.41% natural abundance) and one long-lived radioisotope, <sup>176</sup>Lu with a half-life of 3.78 × 10<sup>10</sup> years (2.59% natural abundance). Thirty-five radioisotopes have been characterized, with the most stable, besides <sup>176</sup>Lu, being <sup>174</sup>Lu with a half-life of 3.31 years, and <sup>173</sup>Lu with a half-life of 1.37 years. All of the remaining radioactive isotopes have half-lives that are less than 9 days, and the majority of these have half-lives that are less than half an hour. This element also has 18 meta states, with the most stable being <sup>177m</sup>Lu (t<sub>1/2</sub> 160.4 days), <sup>174m</sup>Lu (t<sub>1/2</sub> 142 days) and <sup>178m</sup>Lu (t<sub>1/2</sub> 23.1 minutes).
 
 Lutetium (<sup>177</sup>Lu) chloride is a radioactive compound used for the radiolabeling of pharmaceutical molecules, aimed either as an anti-cancer therapy or for scintigraphy (medical imaging). It is an isotopomer of lutetium(III) chloride containing the radioactive isotope <sup>177</sup>Lu, which undergoes beta decay with a half-life of 6.65 days.
 
@@ -24,16 +24,15 @@ This sample has been cleaned of <sup>177m</sup>Lu, therefore the peaks are <sup>
 
 ### Metadata
 
-| Isotope: | Lutetium |
-| --- | --- |
-| Mass number: | 177 |
-| Atomic number: | 71 |
-| Neutron number: | 106 |
-| ... | ... |
+| Isotope:        | Lutetium |
+| --------------- | -------- |
+| Mass number:    | 177      |
+| Atomic number:  | 71       |
+| Neutron number: | 106      |
+| ...             | ...      |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Lutetium#Isotopes](https://en.wikipedia.org/wiki/Lutetium#Isotopes)
 - [https://en.wikipedia.org/wiki/Isotopes_of_lutetium](https://en.wikipedia.org/wiki/Isotopes_of_lutetium)
-- <a href="https://en.wikipedia.org/wiki/Lutetium_(177Lu)_chloride">https://en.wikipedia.org/wiki/Lutetium_(177Lu)_chloride</a>
-
+- <a href="https://en.wikipedia.org/wiki/Lutetium_(177Lu)_chloride">https://en.wikipedia.org/wiki/Lutetium\_(177Lu)\_chloride</a>
diff --git a/collections/_spectrum/Na-22.md b/collections/_spectrum/Na-22.md
index 8ad1f60..9e55c47 100644
--- a/collections/_spectrum/Na-22.md
+++ b/collections/_spectrum/Na-22.md
@@ -1,9 +1,9 @@
 ---
 title: Sodium-22
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Na-22.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Sodium has two radioactive cosmogenic isotopes (<sup>22</sup>Na, with a half-life of 2.6019(6) years; and <sup>24</sup>Na, with a half-life of 14.9560(15) h). With the exception of those two isotopes, all other isotopes have half-lives under a minute, most under a second. The shortest-lived is <sup>18</sup>Na, with a half-life of 1.3(4)×10<sup>-21</sup> seconds.
@@ -19,15 +19,14 @@ Sodium-22 is a radioactive isotope of sodium, undergoing positron emission to <s
 
 ### Metadata
 
-| Isotope: | Sodium |
-| --- | --- |
-| Mass number: | 22 |
-| Atomic number: | 11 |
-| Neutron number: | 11 |
-| ... | ... |
+| Isotope:        | Sodium |
+| --------------- | ------ |
+| Mass number:    | 22     |
+| Atomic number:  | 11     |
+| Neutron number: | 11     |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Sodium](https://en.wikipedia.org/wiki/Sodium)
 - [https://en.wikipedia.org/wiki/Isotopes_of_sodium](https://en.wikipedia.org/wiki/Isotopes_of_sodium)
-
diff --git a/collections/_spectrum/Pb-210.md b/collections/_spectrum/Pb-210.md
index 213a764..347fe2c 100644
--- a/collections/_spectrum/Pb-210.md
+++ b/collections/_spectrum/Pb-210.md
@@ -1,9 +1,9 @@
 ---
 title: Lead-210
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Pb-210.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-08 14:10:00 +0200
-
 ---
 
 The longest-lived radioisotopes of lead (<sub>82</sub>Pb) are <sup>205</sup>Pb with a half-life of 17.3 million years and <sup>202</sup>Pb with a half-life of 52,500 years. A shorter-lived naturally occurring radioisotope, <sup>210</sup>Pb with a half-life of 22.2 years, is useful for studying the sedimentation chronology of environmental samples on time scales shorter than 100 years.
@@ -15,14 +15,13 @@ The longest-lived radioisotopes of lead (<sub>82</sub>Pb) are <sup>205</sup>Pb w
 
 ### Metadata
 
-| Isotope: | Lead |
-| --- | --- |
-| Mass number: | 210 |
-| Atomic number: | 82 |
-| Neutron number: | 128 |
-| ... | ... |
+| Isotope:        | Lead |
+| --------------- | ---- |
+| Mass number:    | 210  |
+| Atomic number:  | 82   |
+| Neutron number: | 128  |
+| ...             | ...  |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Isotopes_of_lead](https://en.wikipedia.org/wiki/Isotopes_of_lead)
-
diff --git a/collections/_spectrum/Pitchblende.md b/collections/_spectrum/Pitchblende.md
index 764ba33..4ab9f22 100644
--- a/collections/_spectrum/Pitchblende.md
+++ b/collections/_spectrum/Pitchblende.md
@@ -1,9 +1,9 @@
 ---
 title: Pitchblende
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Pitchblende.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-08 16:00:00 +0200
-
 ---
 
 Uraninite, formerly pitchblende, is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO<sub>2</sub> but because of oxidation typically contains variable proportions of U<sub>3</sub>O<sub>8</sub>. Radioactive decay of the uranium causes the mineral to contain oxides of lead and trace amounts of helium. It may also contain thorium and rare-earth elements.
@@ -15,14 +15,13 @@ Uraninite, formerly pitchblende, is a radioactive, uranium-rich mineral and ore
 
 ### Metadata
 
-| Isotope: | --- |
-| --- | --- |
-| Mass number: | --- |
-| Atomic number: | --- |
+| Isotope:        | --- |
+| --------------- | --- |
+| Mass number:    | --- |
+| Atomic number:  | --- |
 | Neutron number: | --- |
-| ... | ... |
+| ...             | ... |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Uraninite](https://en.wikipedia.org/wiki/Uraninite)
-
diff --git a/collections/_spectrum/Ra-226.md b/collections/_spectrum/Ra-226.md
index 0351b8d..9bac815 100644
--- a/collections/_spectrum/Ra-226.md
+++ b/collections/_spectrum/Ra-226.md
@@ -1,9 +1,9 @@
 ---
 title: Radium-226
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Ra-226.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 <sup>226</sup>Ra is the most stable isotope of radium and is the last isotope in the (4n + 2) decay chain of uranium-238 with a half-life of over a millennium: it makes up almost all of natural radium. Its immediate decay product is the dense radioactive noble gas radon (specifically the isotope <sup>222</sup>Rn), which is responsible for much of the danger of environmental radium. It is 2.7 million times more radioactive than the same molar amount of natural uranium (mostly uranium-238), due to its proportionally shorter half-life.
@@ -15,14 +15,13 @@ last_modified_at: 2022-08-24 15:10:00 +0200
 
 ### Metadata
 
-| Isotope: | Radium |
-| --- | --- |
-| Mass number: | 226 |
-| Atomic number: | 88 |
-| Neutron number: | 138 |
-| ... | ... |
+| Isotope:        | Radium |
+| --------------- | ------ |
+| Mass number:    | 226    |
+| Atomic number:  | 88     |
+| Neutron number: | 138    |
+| ...             | ...    |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Isotopes_of_radium](https://en.wikipedia.org/wiki/Isotopes_of_radium)
-
diff --git a/collections/_spectrum/RadiumDial.md b/collections/_spectrum/RadiumDial.md
index c386c4b..c5bb7c4 100644
--- a/collections/_spectrum/RadiumDial.md
+++ b/collections/_spectrum/RadiumDial.md
@@ -1,9 +1,9 @@
 ---
 title: Radium Dial
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/RadiumDial.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Radium dials are watch, clock and other instrument dials painted with luminous paint containing radium-226 to produce radioluminescence. Radium dials were produced throughout most of the 20th century before being replaced by safer tritium-based luminous material in the 1970s and finally by non-toxic, non-radioactive strontium aluminate–based photoluminescent material from the middle 1990s.
@@ -17,14 +17,13 @@ Due to the use of <sup>226</sup>Ra only, without adding any other radioisotope,
 
 ### Metadata
 
-| Isotope: | --- |
-| --- | --- |
-| Mass number: | --- |
-| Atomic number: | --- |
+| Isotope:        | --- |
+| --------------- | --- |
+| Mass number:    | --- |
+| Atomic number:  | --- |
 | Neutron number: | --- |
-| ... | ... |
+| ...             | ... |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Radium_dial](https://en.wikipedia.org/wiki/Radium_dial)
-
diff --git a/collections/_spectrum/Re-186.md b/collections/_spectrum/Re-186.md
index d6485c2..e6dc076 100644
--- a/collections/_spectrum/Re-186.md
+++ b/collections/_spectrum/Re-186.md
@@ -1,9 +1,9 @@
 ---
 title: Rhenium-186
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Re-186.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Used as a radiopharmaceutical, unfortunately there is not much more info on this one.
@@ -15,15 +15,14 @@ Used as a radiopharmaceutical, unfortunately there is not much more info on this
 
 ### Metadata
 
-| Isotope: | Rhenium |
-| --- | --- |
-| Mass number: | 186 |
-| Atomic number: | 75 |
-| Neutron number: | 111 |
-| ... | ... |
+| Isotope:        | Rhenium |
+| --------------- | ------- |
+| Mass number:    | 186     |
+| Atomic number:  | 75      |
+| Neutron number: | 111     |
+| ...             | ...     |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Rhenium#Isotopes](https://en.wikipedia.org/wiki/Rhenium#Isotopes)
 - [https://en.wikipedia.org/wiki/Isotopes_of_rhenium](https://en.wikipedia.org/wiki/Isotopes_of_rhenium)
-
diff --git a/collections/_spectrum/Re-188.md b/collections/_spectrum/Re-188.md
index f7e7b53..ccfec02 100644
--- a/collections/_spectrum/Re-188.md
+++ b/collections/_spectrum/Re-188.md
@@ -1,9 +1,9 @@
 ---
 title: Rhenium-188
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Re-188.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Used as a radiopharmaceutical, unfortunately there is not much more info on this one.
@@ -15,15 +15,14 @@ Used as a radiopharmaceutical, unfortunately there is not much more info on this
 
 ### Metadata
 
-| Isotope: | Rhenium |
-| --- | --- |
-| Mass number: | 188 |
-| Atomic number: | 75 |
-| Neutron number: | 113 |
-| ... | ... |
+| Isotope:        | Rhenium |
+| --------------- | ------- |
+| Mass number:    | 188     |
+| Atomic number:  | 75      |
+| Neutron number: | 113     |
+| ...             | ...     |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Rhenium#Isotopes](https://en.wikipedia.org/wiki/Rhenium#Isotopes)
 - [https://en.wikipedia.org/wiki/Isotopes_of_rhenium](https://en.wikipedia.org/wiki/Isotopes_of_rhenium)
-
diff --git a/collections/_spectrum/Sm-153.md b/collections/_spectrum/Sm-153.md
index da6f344..b19251f 100644
--- a/collections/_spectrum/Sm-153.md
+++ b/collections/_spectrum/Sm-153.md
@@ -1,9 +1,9 @@
 ---
 title: Samarium-153
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Sm-153.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-08 14:20:00 +0200
-
 ---
 
 Samarium-153 (<sup>153</sup>Sm) has a half-life of 46.3 hours, undergoing β− decay into <sup>153</sup>Eu. As a component of samarium lexidronam, it is used in palliation of bone cancer. It is treated by the body in a similar manner to calcium, and it localizes selectively to bone.
@@ -15,14 +15,13 @@ Samarium-153 (<sup>153</sup>Sm) has a half-life of 46.3 hours, undergoing β−
 
 ### Metadata
 
-| Isotope: | Samarium |
-| --- | --- |
-| Mass number: | 152 |
-| Atomic number: | 62 |
-| Neutron number: | 90 |
-| ... | ... |
+| Isotope:        | Samarium |
+| --------------- | -------- |
+| Mass number:    | 152      |
+| Atomic number:  | 62       |
+| Neutron number: | 90       |
+| ...             | ...      |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Isotopes_of_samarium](https://en.wikipedia.org/wiki/Isotopes_of_samarium)
-
diff --git a/collections/_spectrum/Tc-99m.md b/collections/_spectrum/Tc-99m.md
index 1dcd9c8..8899807 100644
--- a/collections/_spectrum/Tc-99m.md
+++ b/collections/_spectrum/Tc-99m.md
@@ -1,9 +1,9 @@
 ---
 title: Technetium-99m
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Tc-99m.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Technetium-99m is the hallmark technetium isotope employed in the nuclear medicine industry. Its low-energy isomeric transition, which yields a gamma-ray at ~140.5 keV, is ideal for imaging using Single Photon Emission Computed Tomography (SPECT). Several technetium isotopes, such as <sup>94m</sup>Tc, <sup>95g</sup>Tc, and <sup>96g</sup>Tc, which are produced via (p,n) reactions using a cyclotron on molybdenum targets, have also been identified as potential Positron Emission Tomography (PET) agents. Technetium-101 has been produced using a D-D fusion-based neutron generator from the <sup>100</sup>Mo(n,γ)<sup>101</sup>Mo reaction on natural molybdenum and subsequent beta-minus decay of <sup>101</sup>Mo to <sup>101</sup>Tc. Despite its shorter-half life (i.e., 14.22 min), <sup>101</sup>Tc exhibits unique decay characteristics suitable for radioisotope diagnostic or therapeutic procedures, where it has been proposed that its implementation, as a supplement for dual-isotopic imaging or replacement for <sup>99m</sup>Tc, could be performed by on-site production and dispensing at the point of patient care.
@@ -15,16 +15,15 @@ Technetium-99m is the hallmark technetium isotope employed in the nuclear medici
 
 ### Metadata
 
-| Isotope: | Technetium |
-| --- | --- |
-| Mass number: | 99 |
-| Atomic number: | 43 |
-| Neutron number: | 56 |
-| ... | ... |
+| Isotope:        | Technetium |
+| --------------- | ---------- |
+| Mass number:    | 99         |
+| Atomic number:  | 43         |
+| Neutron number: | 56         |
+| ...             | ...        |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Technetium-99m_generator](https://en.wikipedia.org/wiki/Technetium-99m_generator)
 - [https://en.wikipedia.org/wiki/Isotopes_of_technetium](https://en.wikipedia.org/wiki/Isotopes_of_technetium)
 - [https://en.wikipedia.org/wiki/Technetium-99m](https://en.wikipedia.org/wiki/Technetium-99m)
-
diff --git a/collections/_spectrum/ThoriumSource.md b/collections/_spectrum/ThoriumSource.md
index a7e9f4d..d797959 100644
--- a/collections/_spectrum/ThoriumSource.md
+++ b/collections/_spectrum/ThoriumSource.md
@@ -1,9 +1,9 @@
 ---
 title: Thorium Source
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/ThoriumSource.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:11:00 +0200
-
 ---
 
 Thorium source bought on ebay USA. The exact composition of radioisotopes in this sample is unknown, but could be reverse-engineered with this spectrum. It seems like this source contains of both <sup>232</sup>Th and <sup>234</sup>Th and of course all their daughter products.
@@ -15,15 +15,14 @@ Thorium source bought on ebay USA. The exact composition of radioisotopes in thi
 
 ### Metadata
 
-| Isotope: | Thorium |
-| --- | --- |
-| Mass number: | ? |
-| Atomic number: | 90 |
-| Neutron number: | ? |
-| ... | ... |
+| Isotope:        | Thorium |
+| --------------- | ------- |
+| Mass number:    | ?       |
+| Atomic number:  | 90      |
+| Neutron number: | ?       |
+| ...             | ...     |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Thorium#Isotopes](https://en.wikipedia.org/wiki/Thorium#Isotopes)
 - [https://en.wikipedia.org/wiki/Isotopes_of_thorium](https://en.wikipedia.org/wiki/Isotopes_of_thorium)
-
diff --git a/collections/_spectrum/Uranium-glaze.md b/collections/_spectrum/Uranium-glaze.md
index 77597f2..bf533f5 100644
--- a/collections/_spectrum/Uranium-glaze.md
+++ b/collections/_spectrum/Uranium-glaze.md
@@ -1,10 +1,9 @@
 ---
 title: Uranium Glaze
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Uranium-glaze.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
-
 ---
 
 Uranium tiles have been used in the ceramics industry for many centuries, as uranium oxide makes an excellent ceramic glaze, and is reasonably abundant. The uranium ore itself was considered a waste product and taking advantage of this newly abundant resource, the tile and pottery industry had a relatively inexpensive and abundant source of glazing material. Vibrant colors of orange, yellow, red, green, blue, black, mauve, etc. were produced, and some 25% of all houses and apartments constructed during that period (circa 1920–1940) used bathroom or kitchen tiles that had been glazed with uranium.
@@ -18,15 +17,14 @@ The use of uranium in ceramic glazes ceased during World War II when all uranium
 
 ### Metadata
 
-| Isotope: | --- |
-| --- | --- |
-| Mass number: | --- |
-| Atomic number: | --- |
+| Isotope:        | --- |
+| --------------- | --- |
+| Mass number:    | --- |
+| Atomic number:  | --- |
 | Neutron number: | --- |
-| ... | ... |
+| ...             | ... |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Uranium_tile](https://en.wikipedia.org/wiki/Uranium_tile)
 - [https://en.wikipedia.org/wiki/Uranium_dioxide](https://en.wikipedia.org/wiki/Uranium_dioxide)
-
diff --git a/collections/_spectrum/Zeunerite.md b/collections/_spectrum/Zeunerite.md
index 82f3a0b..ede8ad3 100644
--- a/collections/_spectrum/Zeunerite.md
+++ b/collections/_spectrum/Zeunerite.md
@@ -1,9 +1,9 @@
 ---
 title: Zeunerite
-collection: spectrum
+header:
+  teaser: /assets/images/spectra-th/Zeunerite.png
 #date: 2022-06-07 21:00:00 +0200
 last_modified_at: 2022-08-24 15:10:00 +0200
-
 ---
 
 Zeunerite is a green copper uranium arsenate mineral with formula Cu(UO<sub>2</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>•(10-16)H<sub>2</sub>O. It is a member of the autunite group. The associated mineral metazeunerite is a dehydration product of zeunerite. Zeunerite occurs as a secondary mineral in the oxidized weathering zone of hydrothermal uranium ore deposits which contain arsenic.
@@ -15,14 +15,13 @@ Zeunerite is a green copper uranium arsenate mineral with formula Cu(UO<sub>2</s
 
 ### Metadata
 
-| Isotope: | --- |
-| --- | --- |
-| Mass number: | --- |
-| Atomic number: | --- |
+| Isotope:        | --- |
+| --------------- | --- |
+| Mass number:    | --- |
+| Atomic number:  | --- |
 | Neutron number: | --- |
-| ... | ... |
+| ...             | ... |
 
 ### Sources and Further Read
 
 - [https://en.wikipedia.org/wiki/Zeunerite](https://en.wikipedia.org/wiki/Zeunerite)
-