Stuck on A2 Unit 5 Radiation Question Watch

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Hi , Im stuck on the second part of this question , i can do the first easily but the second is hard and the mark scheme makes no sense ?

AQA Phya5 June 2012
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by second part do you mean 3bi or 3bii?

3bi - you've got a detector of known area at a known distance, r from the gamma source

How about if you worked out the area of the sphere with radius r and then found the ratio of that area to the area of the detector?
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