质子辐照过程的统计分布研究

为了研究一定能量的质子在材料内穿行深度的变化，进而探讨对材料性能的影响，基于质子穿行过程中碰撞的随机性，建立了质子穿行过程的非平衡统计理 论模型。分别计算出了高能和低能质子穿行长大速率函数和穿行深度概率密度函数。并以Kapton薄膜为例，发现高能质子的最概然穿行深度与之对应的最大概率密度的乘积为一个定值；随着低能质子能量的增加，其乘积呈阶梯状递减到一定值；高能和低能的分界线大约在105 eV数量级处。 

Study on Statistical Distribution of Proton Radiation Process

In order to study the effect of proton with some energy in different penetration depth on material properties,a non-equilibrium statistical model of proton irradiation process was established based on the randomness of collisions during passing process to get the passing growth rate function and penetration depth probability density function respectively for high energy and low energy proton.Taking the proton irradiated Kapton film as an example, the analysis results show that,the product of the most probable penetration depth of high-energy proton and its corresponding maximum probability density is a fixed value;but with the energy increasing of the low energy proton,the product of the most probable penetration depth of low-energy proton and its corresponding maximum probability density is gradually reduced to a certain value;by contrast, it is found that the energy demarcation line between high energy proton and low energy proton is about 10⁵ eV.