During nuclear explosion, one of the products is 90 Sr with half-life of 28.1 years. If 1µg of 90 Sr 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.

Options

1. A0.7814 μg of 90 Sr will remain after 10 years and 0.227 μg of 90 Sr will remain after 60 years
2. B0.7814 μg of 90 Sr will remain after 10 years and 0.7814 μg of 90 Sr will remain after 60 years
3. C0.227 μg of 90 Sr will remain after 10 years and 0.227 μg of 90 Sr will remain after 60 years
4. D0.227 μg of 90 Sr will remain after 10 years and 0.7814 μg of 90 Sr will remain after 60 years