RESEARCH ON SOME BORON-BEARING FABRIC AND TRANSPARENT RESIN MATERIALS SHIELDING NEUTRON EFFICIENCY

The shielding neutron efficiency of boron-bearing materials developed recently is introduced. The thermal neutron shield ratio for two kinds of non-waving cloth with thickness of 58 mg/cm2 and 153 mg/cm2 is 51 % and 79%. Their mass attenuation coefficient for 0. 186, 24. 4 and 144 keV neutron is 1. 56,1. 29 and 0. 9 cmVg separately. For the natural boron-bearing transparent resin plate with the thickness of 0. 59 g/cmz,the thermal neutron shield ratio is 85% and for enriched boron or gadolinium-bearing resin plate is 97%. The shield ratios of all three materials for 24. 4 keV neutrons are 38%. The transparence of natural light for enriched boron-bearing resin plates is no considerable change after they were exposed to thermal neutrons up to 6 Sv. After they were exposed up to 20 Sv,the transparence reduces to 50% but the thermal neutron shield ratio does not change. The gadolinium-bearing plate has a very strong thermal neutron-capture gamma radiation and its dose-equivalent is greater than the dose-equivalent of incident thermal neutrons.