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从1961年到1968年国际权度局先后组织了13次国际比对,如表1所示。每次比对约有20多个国家参加。每次比对,都有一定的进展。从1961年到1976年,各国对一些专门问题进行了系统的研究,使死时间分辨时间的测量及其修正取得了很大的进展;称重技术有了明显的提高;对液体闪烁计数进行了系统的研究,特别是Cox-Isham公式发表后,用符合方法绝对测量放射性核素活度向前迈进了一大步。
From 1961 to 1968, the International Bureau of Civil Rights organized 13 international comparisons as shown in Table 1. Each time more than about 20 countries to participate. Each comparison, there is some progress. From 1961 to 1976, various countries conducted systematic research on some special problems, made great progress in measurement and correction of dead time resolution time, significant improvement in weighing technology, liquid scintillation counting Systematic studies, especially after the publication of the Cox-Isham formula, have taken a major step forward by measuring absolute radionuclide activity in a manner that is consistent with the methodology.