Half life of 90Sr is 6.93 years. In a ch...

Half life of 90Sr is 6.93 years. In a child body 1 g of 90Sr dopped in place of calcium, how many years will it take to reduce its concentration by 90% (Assume no involvement of Sr in metabolism)

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23.03

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During the nuclear explosion, one of the products is ._(90)Sr with half life of 6.93 years. If mug" of "._(90)Sr was absorbed in the bones of a newly born in place of Ca, how much time (in years) is required to reduce it by 90% . If it is not lost metabolically? Report your answer by rounding it up to a nearest whole number.

During nuclear explosion, one of the products is .^(99)Sr with half - life of 28.1 years. If 1 mug of .^(90)Sr was absorbed in the bones of a newly born baby instead of calcium, how much of its will remain after 10 years and 60 years if it is not lost metabolically.

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A radioactive elements has a half life of 2500 yrs. In how many years will its mass decay by 90% of its initial mass?

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