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使用井型Nal（T1）晶体对125I标准溶液的比活度进行了准确测量，获得的合成不确定度为±0．6％。该结果在日本EIT组织的周边国家和地区的几个实验室间125I，59Fe活度测量比对中，与比对的平均值的偏差为-0．37％，与比对样品在国际权度局（BIPM）的国际参考系统（SIR）测量的平均值偏差为0．06％。
Accurate measurement of the specific activity of 125I standard using well-type Nal (T1) crystals yields a combined uncertainty of ± 0.6%. The results in the Japanese EIT organizations in neighboring countries and regions in several laboratories 125I, 59Fe activity measurement comparison, the deviation from the average of the comparison was -0.37%, compared with the sample in the international authority The mean deviation of the International Reference System (SIR) measurements from the Bureau (BIPM) was 0.06%.