60Co γ辐射空气比释动能基准的研究进展和相关国际比对

摘要

60Coγ辐射空气比释动能基准是医用加速器光子水吸收剂量的重要溯源基准之一.近三年来,中国计量科学研究院(NIM)先后就60Co γ辐射空气比释动能参加了国际原子能机构(IAEA)的国际比对,以及国际计量局(BIPM)组织的新一轮的关键比对,最新的关键比对数据库(KCDB)结果表明,NIM的比对结果与国际计量研究机构及地区基准实验室的结果之间的一致性较好.%The air kerma standard of the 60Co γ radiation is one of the important traceable standards for the absorbeddose to water of photon beams from the clinical accelerator.In recent 3 years,Nationul Institute of Metrology (NIM) of China has performed the bilateral comparison on the air kerma for the 60 Co γ radiation with International Atomic Energy Agency(IAEA),and participated in the ongoing BIPM.RI(I)-K1 comparison.According to the latest Key Comparison Data Base (KCDB),the comparison result of NIM is consistent with that of other primary laboratories within the international and regional metrology community.