1. The problem statement, all variables and given/known data A beam of 0.38 MeV neutrons is incident on a 113Cd foil of thickness 1mm. The absorption 48 cross-section for 0.38 MeV neutrons is 5 barns. What is the fraction of neutrons absorbed by the foil? 3. The attempt at a solution I'm not sure whether I should treat this as scattering in a thick or thin foil and how the energy of the incoming particles is related to the total scattering of particles. Thanks.