Question

Given: 1eV=1.6×10-19 Joules, 1Ci=3,7×1010 des/s.
A 2 mCi of 60Co source emits two gamma rays per disintegration with energies of E1=1172 and E2=1332 keV.  10% of gamma rays emitted from the source have been fully absorbed in a cube with a 10 cm side and a density of 2g/cm3.
The mass of the cube is m=.V, where V is the volume of the cube.
Do your calculation and circle the correct answer for:
⦁   The number of gammas per second, N, emitted by the 60Co source at t=0.
⦁   The absorbed dose D in the cube for 10 minutes exposure, in Gy
⦁   The absorbed dose rate in the cube, in Gy/hr.

⦁   N= 74×106 /s, D = 889×10-6 Gy, = 0.534×10-5 Gy/h
⦁   N = 148×106 /s, D = 88.9×10-6 Gy, = 534×10-5 Gy/h
⦁   N= 148×106 /s, D = 8.89×10-6 Gy, = 5.34×10-5 Gy/h
⦁   None of the above

Answer 1