An international comparison of activity per unit volume of ²²²Rn (EURAMET project N 1475, registered in KCDB as supplementary comparison EURAMET.RI(II)-S8.Rn-222) was organised in 2019 within the framework of the European project MetroRADON. The LNE-LNHB is the pilot of the comparison. Samples of ²²²Rn gas provided by the LNE-LNHB were sent to the participants and were measured using various techniques. The reference value is the power moderated mean (PMM) (Pomm, 2013) of the seven submitted results.

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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).

2019 年在欧洲项目 MetroRADON 的框架内组织了²²² Rn（EURAMET 项目 N 1475，在 KCDB 注册为补充比较 EURAMET.RI(II)-S8.Rn-222）的国际比较活动。LNE-LNHB 是比较的试点。LNE-LNHB 提供的²²² Rn 气体样本被发送给参与者，并使用各种技术进行测量。参考值是七个提交结果的功率调节平均值 (PMM) (Pomm, 2013)。

要访问本文的正文，请单击最终报告。请注意，此文本出现在 BIPM 密钥比较数据库 https://www.bipm.org/kcdb/ 的附录 B 中。

根据 CIPM 互认安排 (CIPM MRA) 的规定，最终报告已通过同行评审并由 CCRI 批准发布。