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The half-life of Tc^(99) is 6 h. The act...

The half-life of `Tc^(99)` is 6 h. The activity of `Tc^(99)` in a patient , 60 h after receiving an injection conataining this radiosotope is at least 0.125 `mu`Ci. What was the minimum activity (in `mu`ci) of the sample injected?

A

1.25`mu`Ci

B

12.5`mu`Ci

C

128 `mu`Ci

D

125 `mu`Ci

Text Solution

Verified by Experts

The correct Answer is:
C
Number of half-lives , `x=(t)/(t_(1/2)` = 60/6 = 10`
Now, `r=r_(0)(1/2)^(X))`
`therefore r_(0) + r^(2)^(X)=0.125 mu Ci xx 2^(10)=128muCi`
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