During nuclear explosion, one of the products is 90Sr with half life of 28.1yr. If 1μg 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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Updated on : 2022-09-05
Solution
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k=t1/20.693
k=28.10.693=0.0247/year
(i) After 10 years, let xμ be the concentration of 90Sr. k=t2.303log[A][A]0
0.0247=10years2.303log(x1)
x=0.782μg
(ii) After 60 years, let yμ be the concentration of 90Sr. k=t2.303log[A][A]0