this post was submitted on 23 Nov 2023
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Are these decay rates specified for isolated atoms?
I believe they would decay faster when bombarded by particles from fellow atoms, no? So we'd have to account for the mass, shape and density of the samples to get true rates. I don't think that would change the rankings, but it might increase Simon's troubles if the radon was frozen or otherwise really compressed, for example.
Probably yes. But I don't think that major reactions would ensue in such quantities of several grams – after all, nuclei are pretty sparse so most radiation would just escape and hit one of the chipmunks or something else. It takes many kilograms of concentrated ²³⁵U to start a runaway fission.