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One of the hazards of nuclear explosion ...

One of the hazards of nuclear explosion is the generation of `Sr` and its subsequent incorporation in bones. This nuclide has a half life of `28.1` years. Suppose one microgram was absorbed by a new`-` born child, how much `Sr` will remain in his bones after 20 years.

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`t=(2.303)/(lamda) log""("initial mass")/("remaining mass")`
`20 =(2.303)/(0.693) xx 28.1" log "((1)/(x)) rArr x=0.61 mu g rArr 610xx10^(-9) g =610` nanograms.
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