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Poster sample. This mineral, Torbernite, appears in my Photographic Periodic Table Poster representing protactinium, because this highly unstable element can't reasonably be photographed. The rock probably contains on the order of a few atoms of protactinium at any one time, as part of the complex decay chain of the uranium that makes up a much larger fraction of the sample. In no meaningful way is protactinium itself visible in the sample, but sadly that's about the best you can do with an element like this. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of.  Source: eBay seller migalf1 Contributor: Jim Markitell Acquired: 3 June, 2005 Price: $27 Size: 1.5" Purity: 0% |
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Concentrate from Uranothorianite. A student in Austria isolated about 0.5 micrograms of protactinium from a sample of uranothorianite and sealed it in this well-made glass ampule. The powder you see is mostly MnO(OH)2 not protactinium: If it were pure protactinium the ampule would quickly melt from the heat and radiation. Protactinium is so intensely radioactive that you probably wouldn't have to have much more that the one part per million in this ampule! Source: Anonymous Contributor: Anonymous Acquired: 4 March, 2004 Price: Donated Size: 2" Purity: 0.000001% |
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Sample from the Everest Set. Up until the early 1990's a company in Russia sold a periodic table collection with element samples. At some point their American distributor sold off the remaining stock to a man who is now selling them on eBay. The samples (except gasses) weigh about 0.25 grams each, and the whole set comes in a very nice wooden box with a printed periodic table in the lid. Radioactive elements like this one are represented in this particular set by a non-radioactive dummy powder, which doesn't look anything like the real element. (In this case a sample of the pure element isn't really practical anyway.) To learn more about the set you can visit my page about element collecting for a general description and information about how to buy one, or you can see photographs of all the samples from the set displayed on my website in a periodic table layout or with bigger pictures in numerical order. Source: Rob Accurso Contributor: Rob Accurso Acquired: 7 February, 2003 Price: Donated Size: 0.2" Purity: 0% |
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Sample from the RGB Set. The Red Green and Blue company in England sells a very nice element collection in several versions. Max Whitby, the director of the company, very kindly donated a complete set to the periodic table table. To learn more about the set you can visit my page about element collecting for a general description or the company's website which includes many photographs and pricing details. I have two photographs of each sample from the set: One taken by me and one from the company. You can see photographs of all the samples displayed in a periodic table format: my pictures or their pictures. Or you can see both side-by-side with bigger pictures in numerical order. The picture on the left was taken by me. Here is the company's version (there is some variation between sets, so the pictures sometimes show different variations of the samples):  Source: Max Whitby of RGB Contributor: Max Whitby of RGB Acquired: 25 January, 2003 Price: Donated Size: 0.2" Purity: <0.2% |
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Uranium ore (inside a Revigator). My Revigator, which contains quite a bit of carnotite uranium ore, probably has more astatine, francium, actinium, and protactinium in it than my depleted uranium metal samples, even though they have far more uranium in them. Look under uranium for a more detailed explanation about what a Revigator is. Source: eBay seller bettyboop Contributor: Theodore Gray Acquired: 13 November, 2002 Price: $90 Size: 12" Purity: <0.1% |
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