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 (10−6g) was absorbed by a new-born child, how much 90Sr will remain in his bones after 20 years?
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Correct option is A)
t50=28.1 years λ=t2.303logCC0 t500.693=t2.303logCC0 28.10.693=202.303logC1×10−6 C=0.6107×10−6g =0.6107μg