Polonium Lethal Dose

I thought this calculation of the lethal dose of Polonium could be interesting (I did not find it anywhere, but maybe it’s just me). Today the BBC published a nice article, but does not explain how a lethal dose can be computed.

The Lifetime Cancer Mortality Risk factor[1] for 1pCi (10^-12 curie[2] one milion of milion […]

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