Hi! I Collect Elements.

I'd have my doubts about the so-called "safe handling" of radioactive materials (of any sort).

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What was the cause of Marie Curie's death?
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History of Science, Marie Curie -

She died from Aplastic Anemia I am quite sure you can guess that is was almost certainly from handing radioactive materials unsafely. Which they didn't really know the dangers about yet. There is also a story about radioactive materials in test tubes that she had in her desk because she like the nice glow they gave off.
Aplastic anemia is a condition where bone marrow does not produce sufficient new red blood cells to replenish the blood.

Marie Curie died in 1934, of what was described as an aplastic pernicious anaemia of rapid, feverish development. This was nearly identical a diagnosis given for the first reported radiation-related death of a radium dial painter. "Rapidly progressing anaemia of the pernicious type" (Martland 1925). It is argued that her death was not a result of Radium exposure because pernicious anaemia believed to be caused by radiation exposures. it is quite likely that her doctor had misdiagnosed her illness, Indeed, her daughter, Eve Curie, wrote (1937): "the abnormal symptoms, the blood tests, differing from those in any known case of pernicious anaemia, accused the true criminal: radium." Marie's eldest daughter and collaborator, Irene Curie, died in her mid-50s of leukaemia. Reference: Curie, E. Madame Curie. Doubleday; Garden City, NY; 1937. Paul Frame, CHP, Ph.D.

Yep, and if you have one of those smoke detectors, you also therefore have Neptunium. Np is one of the elements in the Am-241 decay series, and it has a much longer half-life than Am-241, so it will build up over time. So, after about 20 years your sample will contain about 3% Np.

Now if only I could figure out how to make my hoard of copper pennies gradually turn into gold over time!

It is your topic and it is relevant.

Well, unless it is an obvious self-serving bump.

However, sometimes even those are forgiven.

Very cool collection.

Mine remains unchanged... in an Aiir-Tite capsule.

I have finally found my reference to hydrogenium:
Ref. P.117, 'British Coin Designs and Designers', by H.W.A. Linecar, publ. in 1977, G Bell & Sons, Portugal Street London. (ISBN 0 7135 1931 2).

It is a metallic alloy of hydrogen dissolved in Palladium.
Palladium has the ability to absorb over 600 times it's own volume in hydrogen at standard laboratory temperature and pressure.
Thomas Graham conducted experiments in dissolving various gasses into metals such as in the storage of acetylene.

He was a Fellow of the Royal Society, and Master Worker in The Royal Mint London during the years 1855 until 1869, and also Professor of Chemistry at the University College, London.

He concluded that because so much Hydrogen was dissolved into the Palladium, that a metallic alloy had been formed, and further concluded that hydrogen must be a vaporized metal, because it alloyed into the Palladium.
He proceeded to strike an off metal pattern Half Sovereign from the resulting alloy.

The Russians proceeded further, and also struck some experimental coins and gold plated them, to stop the Hydrogen fro slowly gassing out. Mints proved to be the ideal place to carry out this sort of experimentation at the time.