Homework Answers
number of disintegrations in 3Ci is
3.0 Ci ( 3.7 * 10^10 dintegrations/s/Ci )5 s = 5.55 * 10^11 disintegrations
Total energy of beta particle is
E_Beta = 5.55 * 10^11 disintegrations(2*10^-13 J/ disintegration) = 0.111 J
energy absorbed by 79 kg person is
E/m = 0.111 J/79 kg = 1.40 * 10^-3 gray ( 100 rad/ gray)= 0.140 rad
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