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From one source:
"The energy released by its [polonium 210] decay is so large (140W/g) that a capsule containing about half a gram reaches a temperature above 500C."
Polonium has more isotopes than any other element, from atomic weight 194 to 218. Isotope 210 is particularly nasty. Hard to imagine how it could be surreptitiously used by anyone and remain safe themselves.
Also interesting is that polonium contamination of tobacco fertilizer is one of the main causes of lung cancer in smokers.
Mark.
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