核辐射屏蔽用胶粘剂的理论计算研究

Study on theoretical calculation of nuclear radiation shielding adhesive

利用蒙特卡罗数值模拟法(MC法)、查表法对核辐射屏蔽用胶粘剂的屏蔽效果进行了理论计算和实验验证。研究结果表明,当采用宽束模型进行计算时,搀杂碳化硼和胶粘剂后的屏蔽材料对γ射线(由^(137)Cs发出)的衰减倍数为3.02;当采用窄束模型进行计算时,搀杂碳化硼和胶粘剂后的屏蔽材料对γ射线(由^(137)Cs发出)的衰减倍数为3.31。当核辐射屏蔽材料的组成与配比为m(铅)∶m(碳化硼)∶m(胶粘剂)=90∶5∶5时,辐射屏蔽材料(20mm厚)对^(252)Cf中子的衰减倍数为1.7,对γ射线(由^(137)CS发出)的衰减倍数为2.7,均与理论计算值接近。因此,利用MC法、查表法指导核辐射屏蔽胶粘剂的制备是可行的。

The experiment validation and theoretical calculation of shielding effect on the nuclear radiation shielding adhesive were carried out by Monte Carlo numerical simulation method（MC method） and lookup-table method. The research results showed that the attenuation multiples toward γ radial emited from ^137Cs of shielding material with boron carbide and adhesive were 3.02 by broad beam calculation model and 3.31 by narrow beam calculation model, respectively. The experiment value and theoretical calculation value were almost same because the attenuation multiples of 20 mm-thick shielding material were 1.7 toward ^252Cf neutron and 2.7 toward y radial emited from ^137Cs respectively when mass ratio of Pb：boron carbide：adhesive was 90：5：5 in nuclear radiation shielding. Therefore a guiding preparation of nuclear radiation shielding adhesive was feasible by MC method and lookup-table method.