A 100x10^-6 Ci source emits beta rays each of energy 2.8 MeV, enclosed in hand for 5 minutes.

a) what equivalent does of radiation (in Sv) would you absorb, assuming your hand weighs 0.25kg and has area 100 cm^2, absorbing all incident energy?

I got 5.68x10^13 Sv but this seems way too high

b) Repeat assuming hand is 1m away from radioactive source. (not sure about this)

Question

A 100x10^-6 Ci source emits beta rays each of energy 2.8 MeV, enclosed in hand for 5 minutes.

a) what equivalent does of radiation (in Sv) would you absorb, assuming your hand weighs 0.25kg and has area 100 cm^2, absorbing all incident energy? 

I got 5.68x10^13 Sv but this seems way too high

b) Repeat assuming hand is 1m away from radioactive source. (not sure about this)

anonymous · Answer

Yes way too high.  Did you use the correct conversion from MeV to joules?

1 MeV = 1.602 E-13 Joules

Also did you use  1 Ci = 3.7 E10 dinsint/sec