Standardisation of 89Sr using three different methods.
作者： T Altzitzoglou , B Denecke , L Johansson , G Sibbens
DOI: 10.1016/S0969-8043(01)00229-9
关键词: NIST 、 Mass spectrometry 、 Measurement method 、 Proportional counter 、 Spectrometer 、 Activity concentration 、 Impurity 、 Analytical chemistry 、 Liquid scintillation counting 、 Chemistry
摘要: Three independent methods were used to standardise a 89Sr solution within the frame of an international comparison organised by BIPM/CCRI(II): 4pi liquid scintillation (LS) spectrometry, based on CIEMAT/NIST efficiency tracing method, and direct activity measurements with windowless CsI(Tl)-sandwich spectrometer pressurised gas proportional counter. Quantitative solid point-like sources prepared paying special attention during source drying phase. The impurities in original measured corrected for results all three methods. concentration was found be 26.21 +/- 0.08 kBq g(-1). A new half-life value 50.61 0.05 days determined from LS measurements. measurement methods, including impurity measurements, are described compared. considering advantages disadvantages each method.
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