One of the hazards of nuclear explosion is the generation of \( \mathrm{Sr}^{90} \) and its subs...

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One of the hazards of nuclear explosion is the generation of \( \mathrm{Sr}^{90} \) and its subsequent incorporation in bones. This nucleide has a half life of 30 year. Suppose one microgram was absorbed by a new-born
\( P \) child, how much \( \mathrm{Sr}^{90} \) will remain in his bones after 20 years? [Take : \( \log 1.6=.2, \log 2=.3 \) ]

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