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# A human body excretes certain material by a law similar to radioactivity. The body excretes half the amount injected in 24h. Find the time in which activity falls to 3μCi. If a person is injected technitium (t1/2= 6h) and its activity just after the injection is 6μCi6 h6.3 h4.8 hnone of these

A
6 h
B
6.3 h
C
none of these
D
4.8 h
Solution
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#### 1t= 1t1+1t2

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