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During nuclear explosion, one of the products is ^90Sr with half life of 28.1 yr. If 1 ug of ^90Sr was absorbed in the bones

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During nuclear explosion, one of the products is 90Sr with half life of 28.1 yr. If 1 ug of 90Sr was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10 year and 60 year if it is not lost metabolically.

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During nuclear explosion,

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