Question #113369
How much of a 32 gram sample of I-131 remains after 48 days ?(half life of I-131 is 8 days )
1
Expert's answer
2020-05-04T12:47:59-0400

The radioactive decay equation says

m(t)=m02t/t1/2m(t)=m_0 2^{-t/t_{1/2}}

Hence, we get


m=(32g)248/8=0.5gm=(32\:\rm g) 2^{-48/8}=0.5\:\rm g

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