A comparison of the activity concentration of an ⁵⁵Fe solution was organized by the POLATOM under the auspices of the CCRI(II). The solution was sent to thirteen laboratories; ready-to-measure sources were also prepared using the same ⁵⁵Fe solution in diffusive (polyethylene) vials and sent to twelve laboratories. Twelve measurement reports were received. The results, as well as relevant information on the measurement techniques, are presented and analysed in this paper. The differences in the results obtained from measurements in non-diffusive (glass) and diffusive vials are indicated.

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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).

在 CCRI(II) 的支持下，POLATOM 组织了⁵⁵ Fe 溶液的活性浓度比较。溶液被送到了 13 个实验室；还使用相同的⁵⁵ Fe 溶液在扩散（聚乙烯）小瓶中制备了即用型源，并将其送往 12 个实验室。收到了十二份测量报告。本文介绍并分析了结果以及有关测量技术的相关信息。显示了从非扩散（玻璃）和扩散小瓶中测量获得的结果的差异。

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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。