Nuclear Collection (Part III)

April 1, 2009

Radioactive chemical reagents (and a bit of non-radioactive fake yellowcake) constitute this instalment of my Nuclear Collection feature.

u_metal_lazarDepleted uranium metal from United Nuclear. These two rough-hewn triangular slabs weigh in at about 13 g apiece.  No idea what Bob Lazar cut up to put these on the market, but they’re not a bad deal while they last. They sport very rough, sharp edges and have to be stored under oil because of the risk of pyrophoric ignition.  Uranium fires are a bummer, especially when they occur in your living room.

conquista_uFake yellowcake memento from the Conquista Project.  About 20 cm3 of a canaryyellow, non-radioactive powder that resembles a diuranate salt is contained in a small vial embedded in this commemorative plastic paperweight.  The Conoco-Pioneer strip mining and milling operations in Karnes County, Texas commenced in 1971, for a time producing most of that state’s uranium.

u308_timkoethReal yellowcake, or actually a chemically-pure grade of depleted U3O8 in a 1-lb reagent bottle from Research Organic /Inorganic Chemical Corp.  After calcining, this is indeed what most modern “yellowcakes” resemble both in chemistry and appearance.  This bottle is a gift from another amateur scientist.

uranyl_acetate_2Uranyl acetate reagent bottles.  Uranyl acetate is still widely available as an electron-microscopy stain.  It’s a beautiful color, and like most uranyl salts, exhibits striking UV fluorescence.  The yellow crystals have a faint odor of vinegar.  Likely they taste accordingly (although taking uranium internally is generally frowned upon).

c14_vial_2Vial of urea labeled with 50 microcuries of carbon-14.  C-14 is a weak beta emitter that is best known for its role in carbon dating.  Because of the importance of carbon in biological processes (durrrh!), C-14 is also useful as a tracer in research, which is the suspected purpose of this product from New England Nuclear.  The label says “Use only as authorized by Atomic Energy Commission,” effectively dating this carbon to 1974 or earlier.  Activity is only detectable by removing the lid and holding a Geiger tube over the opening.

bi_210Calibrated bismuth-210 beta sources. Bi-210, or archaically “radium E”, appears in the uranium decay series.  The sources actually contain lead-210 (radium D) with a half-life of 22 years in secular equilibrium with the 5-day Bi-210 daughter.  The weak betas from Pb-210 are absorbed in the source, while the 1.2-MeV betas from Bi-210 are free to escape.  The set is incomplete; present are four sources ranging in activity from 7.73 nCi to 0.364 μCi (measured in 1962).

thorium_bottle_2Quarter pound of thorium nitrate. This bottle of Baker ACS-grade reagent is still sealed, preventing radon from escaping and allowing the delicious thorium decay chain to build up.  The penultimate thorium decay product, thallium-208, is responsible for one of the most energetic gamma rays found in nature: 2.62 MeV.  I use this bottle as a source of 2.62-MeV gamma radiation to calibrate the high end of the energy scale in scintillation spectrometry.


  1. This is my favorite series of posts (obviously?)! You have a “critical mass;-)” building there including the compounds you have extracted. I have a source made by New England Nuclear that has the same “use only as authorized by AEC” even though it was Ba-133 that contained less than even the exempt quantity allowed today. Does the Urea have a nice, pleasant odor? Too bad all the chemical companies are shying away from anything radioactive, but if anyone needs Thorium, Strem Chemical still carries it…..for the time being anyways.

    • Dry reagent or technical grade urea usually has only a slight odor, and often has none. Your thinking of uric acid–though how would you know? You have no actual experience–lot’s of tours, and the president coddling to your project (oops, someone already beat you too that, didn’t they…experience). This is the boy “genius,” given him to Iran, the world will be a safe place with him in charge of their weapons program.

      “Does the Urea have a nice, pleasant odor?” Haha, joke’s on you, dear.

      And buck up, one day you’ll know all this too.

      • Matt, you appear to be more than four years late in delivering your acrimonious, vapid response to another commenter (who was fourteen years old at the time). Very trollish of you, don’tcha think? Anyway, I’m getting weary of your presence on my comments…aside from the pointless ad-hominem here, all you seem to be interested in is pseudo-lawyering.

  2. Carl, recently we’ve been discussing on the thorium-forum how to get a small sample of thorium. The NRC regs seem very restrictive, how have you been able to get your thorium nitrate?


    Also, the half-life of the radon produced in the thorium decay chain is really short (much less than the radon-222 in the uranium decay chain)…why does it concern you?

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