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Damstadtium was named after.... wait for it... the German city of Darmstadt!You were thinking of Ruthenium :-)
You can buy americium and many other elements on luciteria.com
How to Obtain and Extract Americium
so that means that half the cost of the smoke detector is for the americium.
some people (i.e. me) find this useful as im studying physics (nuclear) in year 12 and for my project me and my friend used multiple americium samples to cause a aqueous solution of barium nitrate to turn into something spectacular, try it out yourself, just make sure to keep it in glass using plastice tools prooning through the glassa as alpha particles can be kinda bad for you
So, your last comment regarding the Americum, was "The americium itself, in this smoke detector, is plated onto a small button of metal. Other detectors I have disassembled have the americium plated onto a small disc." And then you said, "it is safe if kept in the glass bottle," but there is no picture of any glass bottle, or anything beyond the metal disc. How was the reader supposed to know what glass bottle you're talking about?
From what I understand, the Am-241 used in these smoke detectors is actually in the form of americium dioxide (AmO2), which is insoluble. That being said, even if it were ingested it shouldn't lead to a significant absorption of Am-241 in the body. It should simply pass through the digestive tract with minimal radiation dose due to gamma rays. It would; however, pose a threat if it were ingested in soluble form. Just to be clear, I do not condone swallowing radioactive material regardless of the physical compound. Just saying, I don't believe it is dangerous if the Am-241 is in the insoluble form of AmO2. Or so I've heard.
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