多路并联二极管辐射场剂量均匀性研究  

Study on the dose uniformity of multi-channel parallel diode

作　　者：李进玺[1] 吴伟[1] 刘逸飞[1] 赵墨[1] 聂鑫[1] LI Jinxi;WU Wei;LIU Yifei;ZHAO Mo;NIE Xin(National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi´an 710024,China)

机构地区：[1]西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室,西安710024

出　　处：《辐射研究与辐射工艺学报》2023年第5期100-106,共7页Journal of Radiation Research and Radiation Processing

摘　　要：多路并联二极管结构是实验室获取低能量、大面积、高剂量率X射线的有效途径之一。本文采用点源数值积分的方法开展了单环和五环并联结构二极管的辐射场剂量均匀性研究。结果表明:距离圆环很近的平面上,辐射场主要集中于圆环在该平面的投影位置,随着距离的增大,辐射逐渐向其他区域分散;对于单环结构二极管,当距离z<15 cm时,随着距离的增大,剂量均匀性>80%的面积先增大后减小,而计算区域内的总剂量逐渐减小;综合考虑剂量均匀性和总剂量,单环结构二极管辐射场最佳实验区域为z=7~9 cm;圆环内径减小只会增强环中心投影点附近的剂量,而平面上剂量均匀性会变差,当圆环外径为10 cm时,最佳内径为8~9.5cm;相比单环,五环并联结构二极管能够大幅增强辐射剂量,明显改善辐射场剂量均匀性和显著增大有效实验区域,z为11~17 cm范围内,五环结构二极管剂量均匀性没有出现大的波动。The multi-channel parallel diode structure is effective in obtaining X-ray with low energy,large area coverage,and high dose rate in laboratory conditions.In this study,the dose uniformity of single-and five-ring structures was studied based on a point source model.The results showed that the radiation field was primarily focused on the projection position of the ring in the plane near the ring;as the distance increased,the radiation was gradually dispersed to other regions.In the case of single ring structure diodes and z<15 cm,80%of the area of the dose homogeneously increased and then decreased with the increasing distance,whereas the total dose in the calculated region decreased gradually.Considering the dose uniformity and total dose,the optimal experimental region of single ring diode radiation field was z=7−9 cm.A smaller inner ring radius will only enhance the dose near the projection point of the ring;however,the uniformity of the dose on the plane will decrease.A larger inner ring radius will also decreased the dose near the projection point of the ring center.When the outer radius of ring was 10 cm,the optimal inner radius was 8−9.5 cm.Compared with the single ring diode,the dose uniformity of the five ring diode can be greatly enhanced,and the dose uniformity of radiation field and effective experimental region can be improved.Moreover,in z=11−17 cm,the five-ring dose uniformity did not exhibit significant fluctuations.

关 键 词：X射线 并联二极管 辐射场 均匀性 

分 类 号：TL501[核科学技术—核技术及应用]