A human body excretes certain material by a law similar to radioactivity- The body excretes half the amount injected in 24 h- Find the time in which activity falls to 3mu Ci- If a person is injected technitium -t-1-2- 6h- and its activity just after the injection is 6mu Ci6 h6-3 h4-8 hnone of these

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A human body excretes certain material by a law similar to radioactivity. The body excretes half the amount injected in $24$ $h$ . Find the time in which activity falls to $3 μ$ $C i$ . If a person is injected technitium ( $t_{1 / 2}$ = $6 h$ ) and its activity just after the injection is $6 μ$ $C i$
$6$ $h$
$6.3$ $h$
$4.8$ $h$
none of these

6

h

none of these

4.8

h

6.3

h

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Solution

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$\frac{1}{t}$ $= \frac{1}{t_{1}} + \frac{1}{t_{2}}$

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