Question: A point source is located 20 cm from the surface along the cylindrical axis of a cylindrical detector. The detector has a circular end surface

A point source is located 20 cm from the surface along the cylindrical axis of a cylindrical detector. The detector has a circular end surface with a diameter of 10 cm. It has an intrinsic peak efficiency at 1 MeV of 12%. The point source emits a 1 MeV gamma ray in 80% of its decays and has an activity of 20 kBq. Neglecting attenuation between the source and detector, calculate the number of counts that will appear under the 1 MeV full-energy peak in the pulse height spectrum from the detector over a 100-second count

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