The results of a regional supplementary comparison of air kerma standards from eight standards laboratories are presented. The three transfer ionisation chambers (two model Exradin A4 chambers and one Exradin A5 chamber manufactured by Standard Imaging, Inc, Middleton, MI, USA) were measured at each laboratory over the period 2013 to 2016. Air kerma calibration coefficients for the transfer instruments were compared for the ISO 4037 narrow- and wide-spectrum series of x-ray beams, in the range from 30 kV to 300 kV. Results from the five primary standard and three secondary standard laboratories were obtained. For each radiation quality, the results were expressed as the ratio of the laboratory to the comparison reference value, which was the average of three laboratories selected for this purpose before the comparison began. The A5 transfer standard was also compared for air kerma at protection-level 137 Cs gamma rays. Laboratories reported their conversion coefficient...

中文翻译：

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APMP补充比较ISO 4037宽窄系列x射线束中的空气比释动能：APMP.RI（I）-S3

介绍了八个标准实验室对空气比释动能标准进行区域补充比较的结果。在2013年至2016年期间，在每个实验室测量了三个转移电离室（两个模型Exradin A4室和一个Exradin A5室，由Standard Imaging，Inc，美国密歇根州密歇根州制造）。转移仪器的空气比释动能校准系数为比较了ISO 4037窄谱和宽谱系列X射线束的范围，范围从30 kV到300 kV。从五个主要标准实验室和三个次要标准实验室获得了结果。对于每种辐射质量，结果均表示为实验室与比较参考值的比率，该值是比较开始前为此目的选择的三个实验室的平均值。还比较了保护级137 Cs伽玛射线下空气比释动能的A5转移标准。实验室报告了它们的转换系数。