摘要
针对电离室的60 Co水吸收剂量校准因子使用中存在的问题,对NIM在60 Co辐射场下校准电离室的水吸收剂量进行了研究。针对校准电离室和校准医用加速器时所考虑修正项的差异,对各修正项进行分析。通过不确定度分析得出60 Co辐射场下校准电离室的不确定度为0.71%,传递到加速器高能光子束下水吸收剂量的不确定度为1.30%。最后,给出医用加速器高能光子束水吸收剂量校准时的建议和注意事项。
In view of the doubts in the use of 60 Co absorbed dose to water calibration factor in the ionization chamber,the calibration factor of absorbed dose to water given by NIM was described in detail.According to the difference of correction items between calibrating ionization chamber and medical accelerator,the correction items were analyzed.The uncertainty of calibration chamber in 60 Co radiation field is 0.71%,and the uncertainty of absorbed dose to water of high-energy photons in accelerator is 1.30%.Finally,the suggestions and precautions for calibrating absorbed dose to water of accelerator high-energy photons were given.
作者
王志鹏
王坤
金孙均
杨小元
范耀东
张健
WANG Zhi-peng;WANG Kun;JIN Sun-jun;YANG Xiao-yuan;FAN Yao-dong;ZHANG Jian(School of Mechanical Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China;National Institute of Metrology,Beijing 100029,China;Beijing Institute of Metrology,Beijing 100029,China)
出处
《计量学报》
CSCD
北大核心
2019年第6期1124-1128,共5页
Acta Metrologica Sinica
基金
国家重点研发计划(2016YFF0200804)
关键词
计量学
60
Co
高能光子束
水吸收剂量校准因子
校准
不确定度
metrology
60 Co
high-energy photons
absorbed dose to water calibration factor
calibration
uncertainty
