镍合金对γ辐射屏蔽的蒙特卡罗模拟

Study on the γ- ray Shielding Effect of Nickel Alloy with MCNP- 4C

随着核技术的广泛应用,辐射屏蔽安全越来越引起人们的关注。γ辐射防护中,典型屏蔽材料铅对人体有害,寻找绿色环保的屏蔽材料具有重要意义。本文运用蒙特卡罗MCNP-4C程序,模拟了铅和2种型号镍合金(Inconel600和Monel400)对不同能量的γ射线的屏蔽情况。模拟结果表明:镍合金的质量吸收系数随γ射线能量的增加减小缓慢,能量较高时(大于1.2Me V)与铅相近,表明可采用镍合金作为γ射线屏蔽材料。由于能量散射影响,镍合金相比铅会产生较多的低能γ射线,可采用多层屏蔽结构的方法消除这一影响。上述结果可为设计出更加有效、环保的γ辐射防护提供指导。

With the wide application of nucleartechnology, the safety of radiation shielding is aroused by people's concern. Inγ radiation protection, the typical shielding materials lead is harmful to human body, so looking forgreen environmental protection shielding materials is important.The γ shielding situation of the lead and two types of nickel alloy is simulated by the MCNP- 4C.The simulation results show that the mass- absorption coefficient of nickel alloy decreases slowly with the increase of gamma- ray energy, and the values are close to lead above the energy 1.2Me V.Therefore nickel alloy is suitable to be shielding materials forgamma rays.Due to energy scattering effect, nickel alloy will produce more the low- energy gamma rays than lead. The effect can be eliminate by the method of multi- layershielding structure. It can guide the design of more efficient, environmental gamma radiation protection.