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A point source of Co-60 gamma rays emits the same number of photons of 1.17 and...

A point source of Co-60 gamma rays emits the same number of photons of 1.17 and 1.33 MeV, with a total fluence rate of 5.7x109 photons cm-1 s -1 at a specified location. What is the energy fluence rate there, expressed in a) erg cm-2 s -1 ? b) J m-2 min-1 ?

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Answer #1

GIven E1 = 1.17 MeV = 1.17 x 1.602 x 10-6 erg = 1.874 x 10-6 erg = 1.874 x 10-13 J
E2 = 1.33 MeV = 1.33 x 1.602 x 10-6 erg = 2.13 x 10-6 erg = 2.13 x 10-13 J
Average value = E = 2.00 x 10-6? erg = 2.00 x 10-13? J
?Total fluence = = 5.7 x 109? photons / cm2 / s = 3.42 x 1015 photons / m2 / min
?Energy fluence rate = = E ? = 2.00 x 10-6? erg x 5.7 x 109? photons / cm2 / s = 11400 erg / cm2 / s
Energy fluence rate = = E ? = 2.00 x 10-13? J x 3.42 x 1015 photons / m2 / min = 684 J / m2 / min

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