论文部分内容阅读
介绍了所研制的含硼材料的中子屏蔽性能。两种厚度(58mg/cm~2,153mg/cm~2)无纺布对热中子的屏蔽率分别为51％和79％,对0.186、24.4和144keV中子,其质量减弱系数分别为1.56、1.29和0.90cm~2/g。质量厚度为0.59g/cm~2的天然硼树脂板对热中子的屏蔽率为85％,改掺浓缩硼或钆的树脂板则为97％,三者对24.4keV中子的屏蔽率均为38％。浓缩硼树脂板经6SV热中子辐照后,其白光透明度无明显变化,20SV辐照则降至原始值的50％左右,但热中子屏蔽性能并无明显变化。钆树脂板的热中子俘获γ辐射较强,其剂量当量超过入射热中子的剂量当量。
The neutron shielding properties of the developed boron-containing materials are introduced. The shielding rates of thermal neutron at two thickness (58mg / cm ~ 2,153mg / cm ~ 2) were 51% and 79%, respectively, while those at 0.186, 24.4 and 144keV neutrons were 1.56, 1.29 and 0.90 cm ~ 2 / g. The natural boron resin plate with the mass thickness of 0.59g / cm ~ 2 has a shielding rate of 85% for the thermal neutron and 97% for the resin plate doped with concentrated boron or gadolinium. The shielding ratios of the three to 24.4keV neutrons Is 38%. Concentrated boron resin plate after 6SV thermal neutron irradiation, the white light transparency did not change significantly, 20SV irradiation was reduced to about 50% of the original value, but the thermal neutron shielding performance did not change significantly. The thermal neutron capture of gadolinium resin plates is stronger with a dose equivalent that exceeds the dose equivalent of the incident thermal neutrons.