Effective Atomic Weight, Effective Atomic Numbers and Effective Electron Densities of Hydride and Borohydride Metals for Fusion Reactor Shielding

摘要

The effective atomic weight, A_(eff), mass attenuation coefficients, μ/ρ, half-value layer, HVL, effective atomic numbers, Z_(eff) and effective electron densities, N_(eff) of hydride and borohydirde metals, with potential shielding applications in fusion reactors have been investigated in the present work. The gamma ray interaction parameters, μ/ρ, HVL, Z_(eff) and N_(eff) were calculated for photon energy range 1 keV-100 GeV. The A_(eff) was calculated using fast neutron removal cross-sections (Σ_R) for neutron energy 2-12 MeV. The effective atomic number using fast neutron Σ_R was evaluated for compound/composite materials first time. The compounds or mixture containing low as well high atomic weight elements are required for fast neutron shielding. The Mg (BH_4)_2, TiH_2 and ZrH_2 hydride and borohydride metals are found to be the superior shielding materials. This study should be useful for design of effective shielding using hydrides and borohydrides metals in fusion reactors.