Observed Penetration of 14-MeV Neutrons in Various Materials

Experimentally observed 14-MeV neutron removal cross sections are presented for 16 materials. At a scattering energy loss of 4 MeV, the effective macroscopic cross section per unit mass (in square centimetres per gram) for a nucleus of mass A is given by 0.25A ^-1.78 + 0.10A^-0.47. Such information provides a simple method for estimating neutron transport in systems driven by thermonuclear neutrons.