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Standardization of ~(169)Yb by the 4πβ-γ method

机译:〜(169)Yb的4πβ-γ方法标准化

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摘要

~(169)Yb was standardized in the framework of an EUROMET international comparison. Two solutions, with approximately activity concentrations of 16 MBq g~(-1) and 1.6 MBq g~(-1) were distributed to the participants by BNM-LPRI-(France). In the Radionuclide Metrology Laboratory of INFIN-HH, the weak solution was standardized using a coincidence method, applying the 'beta-efficiency extrapolation' variant. A simple 4π beta-gamma coincidence equipment was used. Due to the presence of a metastable state with a half-life of 0.66 μs in the decay scheme of ~(169)Tm, a resolution time of 5.1 μs was chosen for the coincidence module. A gamma threshold of 150 keV was used. A second degree extrapolation graph was used, providing an activity concentration value of 1.18 MBq g~(-1) at 15 November 1997, 12 h UT. The combined uncertainty was 0.9%. Using the dilution factor provided by BNM-LPRI, the corresponding activity concentration for the strong solution is 11.989 MBq g~(-1) (u_(A)=0.110MBq g~(-1); 0.92%).
机译:〜(169)Yb是在EUROMET国际比较框架内标准化的。 BNM-LPRI-(法国)向参与者分发了两种溶液,分别具有大约16 MBq g〜(-1)和1.6 MBq g〜(-1)的活性浓度。在INFIN-HH的放射性核素计量实验室中,弱溶液使用巧合方法标准化,并应用了“β效率外推”变体。使用了简单的4πβ-γ重合设备。由于在〜(169)Tm的衰减方案中存在半衰期为0.66μs的亚稳态,因此为重合模块选择了5.1μs的解析时间。使用150 keV的伽马阈值。使用二级外推图,在UT 1997年11月15日12h处提供的活性浓度值为1.18 MBq g〜(-1)。合并的不确定性为0.9%。使用BNM-LPRI提供的稀释因子,强溶液的相应活性浓度为11.989 MBq g〜(-1)(u_(A)= 0.110MBq g〜(-1); 0.92%)。

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