Barquero L Rodríguez, García-Toraño E, Los Arcos J M
Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Ed.3, Avda Complutense 22, Madrid 28040, Spain.
Appl Radiat Isot. 2004 Feb-Apr;60(2-4):615-8. doi: 10.1016/j.apradiso.2003.11.086.
Two solutions, one of 32P with a significant contribution of 33P, and another one of 204Tl were standardized by liquid scintillation counting in the frame of two intercomparison exercises organized by the BIPM in 2002. For the 32P solution, the counting efficiencies for 32P and 33P were obtained by the CIEMAT/NIST method. The individual contributions of 32P and 33P were determined by fitting a set of measurements to a function of the half-lives and counting efficiencies of both component nuclides. 204Tl was also standardized by the CIEMAT/NIST method using two counters, three scintillators, HiSafe 3, Insta-Gel Plus and Ultima-Gold, and two different kinds of samples. A total of 480 samples were measured over 45 days with results in full agreement within the uncertainties considered. The efficiency values are also compared to those used in the previous 204Tl intercomparison (1997).
在国际计量局（BIPM）于2002年组织的两次比对活动中，通过液体闪烁计数法对两种溶液进行了标准化，一种是含有显著量33P的32P溶液，另一种是204Tl溶液。对于32P溶液，采用CIEMAT/NIST方法获得了32P和33P的计数效率。通过将一组测量值拟合为两种组成核素的半衰期和计数效率的函数，确定了32P和33P的各自贡献。204Tl也采用CIEMAT/NIST方法进行标准化，使用了两个计数器、三种闪烁体（HiSafe 3、Insta - Gel Plus和Ultima - Gold）以及两种不同类型的样品。在45天内共测量了480个样品，结果在考虑的不确定度范围内完全一致。还将效率值与之前（1997年）204Tl比对中使用的值进行了比较。
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