One of the hazards of nuclear explosion is the generation of 90Sr and its subsequent incorporation in bones. This nuclide has a half life of 28.1 years. Suppose one microgram was absorbed by a new-bor

Question

One of the hazards of nuclear explosion is the generation of 90Sr 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 90 Sr in nanograms will remain in his bones after 20 years? Use : pH of 0.61 M HCl is approximately 0.214.

TestHub · Accepted Answer

t = λ 2.303 ​ l o g ( re mainin g ma ss ini t ia l ma ss ​ ) 20 = 0.693 2.303 ​ × 28.1 l o g ( x 1 ​ ) x = 0.61µ g (given − l o g 0.61 = 0.214 ). Thus, x = 610 × 1 0 − 9 g = 610 nan o g r am s .

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