材料的替代对γ本底降低影响的研究

Material Substitution Decreases to the Background Influence of the Study

低γ本底环境对提高检测精度有重要促进作用,在营造低本底环境的过程中,一方面是由屏蔽结构影响环境本底水平,另一方面材料选择对于降低γ本底同样具有重要的影响。常规材料构筑物可以一定程度减弱宇宙射线和周围环境对本底的影响,但是其本身所含有的放射性核素如铀系元素,钍系元素等会对环境本底产生影响,使用这些材料想要进一步降低环境本底水平时就会变得较为困难,选择合适的低放射性材料替代传统材料可以有效降低环境本底值水平。该文通过研究在屏蔽结构一定情况下,以低放射性石英砂等材料替代传统建材中的添加剂,以低放射性的金属建材替代普通金属材料,利用模拟计算与实际检测相结合,对本底环境进行监测,探究在不影响建筑相关力学性能的前提下,优化不同材料对降低环境本底值的作用。

Low background environment has an important role in improving the accuracy of detection.In the process of creating a low background environment,on the one hand,the shielding structure affects the environmental background level,and on the other hand,material selection also has an important impact in reducing the background.Routine material structures can somewhat weaken the impact of cosmic radiation and the surrounding environment on the background,but it itself contains a radionuclide such as uranium elements,thorium elements will have an impact on the environmental background,using these materials becomes more difficult to further reduce the environmental background level,choose the appropriate low radioactive materials instead of traditional materials can effectively reduce the environmental background value level.In this paper,we study the effect of replacing traditional building materials with low radioactive quartz sand materials,monitor the background environment using simulation calculation and actual detection,and explore the effect of optimizing different materials on reducing the environmental background value without affecting building related mechanical properties.