模拟X射线热-力学效应电子束能谱的优化研究

实验室中主要采用电子束辐照来研究材料的热-力学响应规律,并以此为依据对材料抗核爆X射线的能力进行评估,此种评估方式忽略了电子束与X射线与物质相互作用中的差异,必然造成评估偏差。利用MCNP软件和约束最小二乘法,以1keV和3keV黑体X射线为优化对象,以电子束在介质中产生与X射线相同的能量沉积剖面为优化目的,对用于辐照铝、铜和钽三种材料的电子束能谱进行了优化计算,分别得到了它们的等效电子能谱。结果表明:等效电子能谱能够获得与相应的X射线一样的能量沉积剖面,可用作评估材料抗核爆X射线能力的依据;但等效电子谱与X射线和辐照材料均相关,应用中需依据辐照材料做出相应调整。

Optimization of electron beam spectrum of simulating of X-ray thermo-mechanical response

The thermo-mechanical response of materials is an important basis for evaluating the resistance ability of materials to nuclear explosion X rays resistance. Electron beam irradiation is used to study the thermo-mechanical response of materials in laboratory and to evaluate resistance ability of materials to nuclear explosion X rays. Neglecting the difference between electron beam and X rays, this method will cause biases. MCNP and the least square method are used to optimize electron spectra for simulating the energy deposition profiles caused by 1 keV and 3 keV X rays in aluminum, copper and tantalum. The results show that it can get the same energy deposition profiles as X rays do, which can be used to evaluate resistance ability of materials to nuclear explosion X-rays, but in these processes, X rays spectrum and materials should be taken into account.