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本文描述了一起涉外钴 60污染不锈钢表带产品部件———表带拆生针剩余坯料的现场取样程序 ,从已查获的 9kg(约 3 2 1 0 0根 )表带拆生针剩余坯料中抽取 61 9根样品 ,由国内较具权威的三家放射性测量机构对各自样本独立进行测量分析 ,另一家放射性测量机构参加样品成对测量比对 ;给出了各放射性测量机构对同一总体中抽取的各自样本的测量分析结果。测量结果表明 ,所抽取的 61 9根样品中 ,有 1 41根含放射性钴 60 ;其钴 60的活度浓度值明显呈两组数据分布。对各机构测量分析的结果 ,进行了配对t统计检验 ;结果表明 :在 95 %的显著性水平下 ,没有理由认为他们测量分析的各自样本中放射性钴 60的活度浓度值不相等。对三家放射性测量机构测量各自样本中样品的放射性钴 60活度浓度值进行合并统计 ,高值组 1 43个样品 ,平均值和标准差分别为 2 2 4.8和 1 1 .9Bq/g ;低值组 3 8个样品 ,平均值和标准差分别为 72 .4和 1 1 .5Bq/g ;最大活度浓度值为 2 85 .7Bq/g;即使是单根不锈钢表带拆生针坯料样品中的最大活度浓度 ,也在某国电离辐射防护办公室通报的活度浓度 (1 0 0 0Bq/ 0 .2g)的 1 / 1 7以下。
This article describes an on-site sampling procedure for the remaining blanks of a stainless steel bracelet with a foreign-made cobalt-60-contaminating stainless steel strap. From the 9 kg (about 32,000 straps) seized strap remaining blanks A total of 61 9 samples were taken from three authoritative radioactivity measurement institutions in our country to conduct independent measurement and analysis of their respective samples. Another radiometric institution participated in the sample pairwise comparison and comparison. Measurement results of the respective samples. The measurement results show that of the 61 samples collected, 41 have radioactive cobalt 60; and the activity concentration of cobalt 60 clearly shows two sets of data distribution. The result of the measurement and analysis of each institution was analyzed by the paired t-test. The results showed that there was no reason at 95% significance level that the activity concentration values of radioactive cobalt 60 in their respective samples were not equal. The radioactive cobalt 60 activity concentration values of the three radiometrically measured samples in the respective samples were combined and statistically analyzed. The average value and standard deviation of the 43 samples in the high value group were 2 2 4.8 and 1 1 .9Bq / g, respectively. In the group of 38 samples, the mean and standard deviation were 72.4 and 115.1Bq / g, respectively, and the maximum activity concentration was 2 85.7Bq / g. Even in the single stainless steel strap broach sample Of the maximum activity concentration, but also in a country Ionizing Radiation Protection Office reported activity concentration (100Bq / 0 .2g) of 1/7 or less.