放射性核素活度计量

出处：按学科分类—工业技术 企业管理出版社《计量专业工程师手册》第528页（1780字）

放射性核素活度是电离辐射计量中最重要的量。早期人们曾以与镭处于平衡状态的氡气的衰变数作为活度的基准。现在这个量的基准已不再是某一具体的物质，而是一种或一组活度基准装置及其相应的计量方法。

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