在国家计量科学研究院对32P和204Tl进行绝对标准化。
The absolute standardization of 32P and 204Tl at LNMRI.
作者信息
da Cruz Paulo A L, Iwahara Akira, Bernardes Estela M O, da Silva Carlos J
机构信息
Laboratório Nacional de Metrologia das Radiações Ionizantes, Instituto de Radioproteção e Dosimetria, Comissão Nacional de Energia Nuclear, Av. Salvador Allende, s/n-Recreio, CEP Rio de Janeiro 22780-160, Brazil.
出版信息
Appl Radiat Isot. 2004 Feb-Apr;60(2-4):415-8. doi: 10.1016/j.apradiso.2003.11.051.
32P and 204Tl solutions were standardized within the frame of the international key comparisons organized by bureau international des poids et mesures, in 2002. The activity concentration of 32P was measured by counting solid sources in a 4pibeta proportional gas flow counter and by liquid scintillation counting. The self-absorption in solid sources for 4pibeta counting and the presence of 33P as an impurity were evaluated. The combined standard uncertainty for 32P was 0.59% in the 4pibeta counting and 0.38% in the liquid scintillation counting. Liquid scintillation counting was used to measure the activity concentration of 204Tl with combined standard uncertainty of 0.35%.
32P和204Tl溶液于2002年在国际计量局组织的国际关键比对框架内进行了标准化。32P的活度浓度通过在4πβ正比气流计数器中对固体源计数以及液体闪烁计数来测量。评估了4πβ计数中固体源的自吸收以及作为杂质的33P的存在情况。32P在4πβ计数中的合成标准不确定度为0.59%，在液体闪烁计数中为0.38%。液体闪烁计数用于测量204Tl的活度浓度，合成标准不确定度为0.35%。
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