of 
was absorbed in
the bones of a newly born baby instead of calcuium, how much of it will remain
after 10 years and 60 years if it is not lost metabolically.
Answer:
t1/2 = 28.1 y
(i) Initial amount
of 90Sr, (a) = 
t = 10 years, (a ?
x) = ?
Applying the
reaction
or 
(ii) Initial
amount, a = 
t = 60 years, (a ? x) = ?
Solve similar to
(i) (a ? x) = 0.228 
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