During nuclear explosion one of the products is 90 Sr with half-life of 28.1 yr. If 1μg of 90Sr was absorbed in the bones of a newly born body instead of calcium, how much of it will remain after 60 yr, if it is not lost metabolically?
a. 0.025 μg
b. 0,26 μg
c. 0,228 μg
d. 0,184 μg
