高剂量率近距离192Ir治疗源的井型电离室仪器的校准

王继; 吴钦宏; 赵亮; 吕雅竹; 王军良; 杨小元; 王培玮

doi:10.3969/j.issn.1000-1158.2021.09.18

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计量学报 ›› 2021, Vol. 42 ›› Issue (9) : 1232-1236. DOI: 10.3969/j.issn.1000-1158.2021.09.18

电离辐射、标准物质与生物计量

高剂量率近距离192Ir治疗源的井型电离室仪器的校准

王继¹,吴钦宏²,赵亮¹,吕雅竹¹,王军良³,杨小元¹,王培玮¹

作者信息 +

Calibration of Well Type Ionization Chamber Instruments with High-dose-rate After-loading 192Ir Source

WANG Ji¹,WU Qin-hong²,ZHAO Liang¹,Lü Ya-zhu¹,WANG Jun-liang³,YANG Xiao-yuan¹,WANG Pei-wei¹

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文章历史 +

摘要

针对后装治疗用192Ir放射源的参考空气比释动能率的量值急需进行溯源。参考国际通例,由指型电离室(PTW-30013)在60Co γ射线和250kV X射线下的空气比释动能校准因子推导得出192Ir γ射线的空气比释动能校准因子,从而测定192Ir放射源参考空气比释动能率标准值,进而完成对井型电离室的参考空气比释动能率校准。通过不确定度评定得出:192Ir放射源的参考空气比释动能率的不确定度为3.6%,井型电离室校准因子的不确定度为3.8%。

Abstract

There is an urgent need for traceability of the reference air kerma rate for the 192Ir source for high-dose-rate after-loading. Referring to the international general practice, the calibration factor of the 192Ir gamma ray is derived from the calibration factor of air kerma of finger ionization chamber under 60Co gamma ray and 250kV X-ray, so as to determine the standard value of the 192Ir gamma ray reference air kerma rate, and then the calibration of reference air kerma rate of well type ionization chamber is completed. The results show that the uncertainty of the 192Ir gamma ray reference air kerma rate is 3.6%, and that of calibration factor of well type ionization chamber is 3.8%.

导出引用

王继,吴钦宏,赵亮,吕雅竹,王军良,杨小元,王培玮. 高剂量率近距离192Ir治疗源的井型电离室仪器的校准[J]. 计量学报. 2021, 42(9): 1232-1236 https://doi.org/10.3969/j.issn.1000-1158.2021.09.18

WANG Ji,WU Qin-hong,ZHAO Liang,Lü Ya-zhu,WANG Jun-liang,YANG Xiao-yuan,WANG Pei-wei. Calibration of Well Type Ionization Chamber Instruments with High-dose-rate After-loading 192Ir Source[J]. Acta Metrologica Sinica. 2021, 42(9): 1232-1236 https://doi.org/10.3969/j.issn.1000-1158.2021.09.18

中图分类号： TB98

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