计量学报2023，Vol.44Issue(12)：1882-1888,7.DOI:10.3969/j.issn.1000-1158.2023.12.14
高剂量率192 Ir γ射线参考辐射场的搭建
Construction of High Dose Rate 192 Ir γ-rays Reference Radiation Field
摘要
Abstract
To complete the absolute measurement of the reference air kerma rate of the high dose rate 192 Ir radioactive source,a special irradiator and positioning device was designed,and a collimated reference radiation field was built using a medical high dose rate brachytherapy machine.Concerning relevant standards such as ISO 4037,the scattering,radiation field,half-value layer,effective energy and other related parameters of the reference radiation field were measured.The results show that the ambient scattering share is less than 0.003%of the main beam at multiple locations in the radiation field;at a distance of 1.4 m from the radiation source,the diameter of the radiation field is 98 mm,which is larger than the benchmark graphite cavity ionization chamber;the layer measurement result is Cu of 8.224 mm,and the effective energy is 402.8 keV.The 192 Ir energy spectrum measured by HPGe detector is in good agreement with the simulated spectrum.All the parameters met the requirement of the 192 Ir brachytherapy source reference air kerma rate to reproduce the magnitude,which laid the foundation for its absolute measurement and international comparison.关键词
电离辐射/参考空气比释动能率/近距离治疗/192Ir放射源Key words
Ionizing radiation/reference air kerma rate/brachytherapy/192 Ir radioactive source分类
通用工业技术引用本文复制引用
支世杰,王继,王培玮,吴金杰,任世伟..高剂量率192 Ir γ射线参考辐射场的搭建[J].计量学报,2023,44(12):1882-1888,7.基金项目
中国计量科学研究院基本科研业务费(AKYZZ2017) （AKYZZ2017）
