拉萨饮用水源总α放射性测量及其不确定度评定
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摘要
为测量拉萨地区饮用水源总α放射性,并评定测量结果不确定度,依据行业标准,测量该地区饮用水源总α放射性,并根据计算公式和不确定度分析实验评定不确定度主要来源及其大小。测量结果表明:该地区饮用水源总α放射性均较低(≤0.05 Bq·L~(-1))。测量不确定度分别为:样品源测量不确定度为19.31%;仪器效率刻度不确定度为2.28%;源的制备不确定度为1.89%;水样残渣不确定度为0.26%;水样体积不确定度为0.05%。
To measure the level of gross α radioactivity for drinking water source in Lasa and evaluate the uncertainty in the measurement,some water samples have been measured based on industry standard methods. Regarding to these samples,the main sources and quantities of uncertainty in the measurements have also been analyzed and confirmed by calculation formula and uncertainty analysis experiments. The experimental results show that gross α radioactivity for drinking water source in Lasa is relatively low( ≤0. 05 Bq·L- 1). The results of uncertainty in the measurements are as following: the uncertainty in sample measurement is 19. 31%,in efficiency calibration of the instrument 2. 28%,in preparing source 1. 89%,in sample residues 0. 26%,in sample volume 0. 05%.
To measure the level of gross α radioactivity for drinking water source in Lasa and evaluate the uncertainty in the measurement,some water samples have been measured based on industry standard methods. Regarding to these samples,the main sources and quantities of uncertainty in the measurements have also been analyzed and confirmed by calculation formula and uncertainty analysis experiments. The experimental results show that gross α radioactivity for drinking water source in Lasa is relatively low( ≤0. 05 Bq·L- 1). The results of uncertainty in the measurements are as following: the uncertainty in sample measurement is 19. 31%,in efficiency calibration of the instrument 2. 28%,in preparing source 1. 89%,in sample residues 0. 26%,in sample volume 0. 05%.
引文
[1]中国疾病预防控制中心环境与健康相关产品安全所,中国地质科学院水文地质环境地质研究所,中国食品发酵工业研究院,等.GB/T 8538-2008饮用天然矿泉水检验方法[S].北京:中国标准出版社,2008.
[2]中华人民共和国卫生部,中国国家标准化管理委员会.GB/T 5750.13-2006生活饮用水标准检验方法放射性指标[S].北京:中国标准出版社,2006.
[3]中国计量科学研究院.JJF1059-1999测量不确定度评定和表示[S].北京:中国计量出版社,1999.
[4]程真文.BH1227低本底测量仪测量水中放射性总α、β不确定度分析[J].科技论坛,2013,25(1):489-492.
[5]龚书浩.BH1227B测量总α、β放射性不确定度评价[J].计量与测试技术,2003,5(5):50-54.
[2]中华人民共和国卫生部,中国国家标准化管理委员会.GB/T 5750.13-2006生活饮用水标准检验方法放射性指标[S].北京:中国标准出版社,2006.
[3]中国计量科学研究院.JJF1059-1999测量不确定度评定和表示[S].北京:中国计量出版社,1999.
[4]程真文.BH1227低本底测量仪测量水中放射性总α、β不确定度分析[J].科技论坛,2013,25(1):489-492.
[5]龚书浩.BH1227B测量总α、β放射性不确定度评价[J].计量与测试技术,2003,5(5):50-54.