治疗水平电离室剂量计X射线能量响应的研究

摘要

通过中能X射线(60～250 kV)照射量国家基准,研究电离辐射治疗水平电离室剂量计的能量响应.对有代表性的三种类型电离室剂量计在中能X射线标准辐射场中进行校准,获得X射线能量响应的平均值和标准偏差,结果显示两种类型的电离室能量响应小于4％,能够满足治疗水平电离室国家计量检定规程的要求.%The X - rays energy response of three types of ionization chamber dosimeter was researched used by the radiation beam of the primary exposure standard for medium energy X - rays ( 60 - 250 kV). Ten instruments of every type dosimeter were calibrated, the average value and the standard deviation of energy response were obtained, and we also analyzed and evaluated the results. The energy response of two types of ionization chamber is below 4% , it is suitable for application in radiotherapy according to the verification regulation of i-onization chamber dosimeters used in radiotherapy.