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One of the hazards of nuclear explosion ...

One of the hazards of nuclear explosion is the generation of `.^(90)Sr` and its subsequent incorporation in bones. This nuclide has a half-life of `28.1` year. Suppose one micro-gram was absorbed by a new-born child, how much `Sr^(90)` will remain in his bones after 20 year?

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The correct Answer is:
`(6.1xx 10^(-7)g)`
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One of the hazards of nuclear expolsion is the generation of .^(90)Sr and its subsequent incorportion in bones. This nuclide has a half-life of 28.1 year. Suppose one microgram was absorted by a new-born chid, how much Sr^(90) will remain in his bones after 20 year?

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