低能X射线空气比释动能国际关键比对

Key Comparison of the Air-kerma of the NIM and the BIPM in Low-energy X-rays

为促进我国在低能X射线空气比释动能计量领域内的量值统一并达到国际等效,中国计量科学研究院(NIM)于2018年采用平板自由空气基准电离室复现低能X射线空气比释动能,并通过传递电离室Radcal-RC6M在国际计量局(BIPM)低能X射线辐射场中开展了间接比对,其比对结果在合成标准不确定度为0.37%范围内与国际计量局等效一致,该比对结果已纳入国际计量局的关键比对数据库(KCDB)。

In order to promote the unification of measurement values in the field of low-energy X-ray air kerma measurement in China and achieve international equivalence,National Institute of Metrology,China(NIM)measured the air kerma of low-energy X-ray absolutely with a plate free air ionization chamber which is the primary standard in 2018.Two transfer ionization chambers named Radcal-RC6M were calibrated in low energy X-ray radiation field at NIM and BIPM.The comparison results are equivalent to those of the BIPM within the range of 0.37%of the relative standard uncertainty.The comparison results have been included in the key comparison database(KCDB)of the BIPM.