摘要
移动式放射性惰性气体监测仪对不同能量的γ射线存在不同的能量响应,为了提高其测量γ射线的准确性,需要对该监测仪进行能量响应补偿。利用MCNP(Monte Carlo N Particle Transport Code)软件模拟监测仪中的Na I(Tl)晶体在不同铅孔模型下的能量响应,通过比较不同模型下的标准偏差,选出屏蔽铅孔的最佳尺寸。模拟得出补偿铅孔的半径为3.0 cm、厚度为0.5 cm时,该监测仪的能量响应得到较好补偿。
[Background] The mobile radioactive gas monitor responses differently to gamma rays at different energies. [Purpose] This study aims to accurately measure the dose of gamma radiation monitor by means of compensation for energy response. [Methods] Energy responses of Na I（Tl） crystals in the monitor in different lead-hole models were simulated using Monte Carlo N Particle Transport Code（MCNP） software. Various sizes of shielding lead hole were selected to compare the standard deviations of different models, and the optimum size of shielding lead hole was obtained. [Results ＆ Conclusion] The simulation result shows that the energy response of monitor is best compensated when the radius of hole is 3.0 cm and thickness of shielding lead is 0.5 cm.
出处
《核技术》
CAS
CSCD
北大核心
2018年第3期44-48,共5页
Nuclear Techniques
基金
中国科学院战略性科技先导专项(No.XD02001003)资助~~
