A key comparison has been made between the air-kerma standards of the NRC and the BIPM in mammography x ray beams. The results show the standards to be in agreement at the level of the combined standard uncertainty of 3.2 parts in 10 3 . The results are analysed and presented in terms of degrees of equivalence, suitable for entry in the BIPM key comparison database. == Main text To reach the main text of this paper, click on Final Report [https://www.bipm.org/utils/common/pdf/final_reports/RI/RI(I)-K7/BIPM.R(I)-K7_NRC_2018.pdf] . Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/ [http://kcdb.bipm.org/] . The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

中文翻译：

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NRC，加拿大的空气比释动能标准BIPM.RI（I）-K7与X线摄影X线检查中BIPM的主要比较

在乳腺X射线检查中，NRC和BIPM的空气比释动能标准之间进行了关键比较。结果表明，该标准在10 3中的3.2个部分的组合标准不确定度水平上是一致的。分析结果并按照等价程度进行介绍，适合将其输入BIPM密钥比较数据库中。==正文要访问本文的正文，请单击最终报告[https://www.bipm.org/utils/common/pdf/final_reports/RI/RI(I)-K7/BIPM.R(I ）-K7_NRC_2018.pdf]。请注意，此文本显示在BIPM密钥比较数据库kcdb.bipm.org/ [http://kcdb.bipm.org/]的附录B中。根据CIPM相互认可安排（CIPM MRA）的规定，最终报告已由CCRI进行同行评审并批准发布。