4.17 During nuclear explosion, one of the products is with half-life of 28.1 years. If of was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10 years and 60 years if it is not lost metabolically.
half life = 21.8 years
by putting the value we get,
taking antilog on both sides,
[R] = antilog(-0.1071)
Thus 0.781 of will remain after given 10 years of time.