A small 10-gram source of cobalt-60 is in a vacuum. (a) What is the activity of the cobalt-60 source in Bq? (b) What is the actual gamma-ray flux in cm2 -s-1 at a point of measurement 500 cm from the source due to the cobalt-60 emitted gamma-rays? (c) If the background gamma-ray flux in the vicinity of the 10-g source is 7.8×107 cm-2-s-1, what is the total gamma-ray flux at the point of measurement, including the background?

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Question

A small 10-gram source of cobalt-60 is in a vacuum. (a) What is the activity of the cobalt-60
source in Bq? (b) What is the actual gamma-ray flux in cm2
-s-1 at a point of measurement
500 cm from the source due to the cobalt-60 emitted gamma-rays? (c) If the background
gamma-ray flux in the vicinity of the 10-g source is 7.8×107
cm-2-s-1, what is the total
gamma-ray flux at the point of measurement, including the background? (d) What thickness
of a lead shield in cm would have to be placed between the source and the point of
measurement to reduce the total of the background plus the uncollided gamma-ray flux from
the cobalt-60 source to 1.00×108
cm-2-s-1 at that point?

(I've attempted part a of the problem and don't know how to continue)

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