Problem 4. Boral isthe material composed of 50 % Al, 40 % B, and 10 % C by weight. Itsdensity is 2.56 g/cm3. A beam of0.025-eV neutrons with intensity of5´106neutrons/(cm2×s)strikes a target of 2.5 cm2 in area made of theboral.
- Calculate the atom densities of Al, B, and C in boral.
- Calculate the macroscopic cross-sections Sa,Ss, and St for boral at the neutron energy0.025 eV.
- How thick must the boral target be in order to reduce theintensity of such neutron beam by a factor of 7 ?
