Measurements of some radionuclides using a new TDCR system and an ultra low-level conventional LSC counter in CPST, Lithuania
作者： A. Gudelis , A. Vinčiūnas , P. Butkus , M. Pranaitis
DOI: 10.1016/J.APRADISO.2012.02.091
关键词: Coincidence 、 Electron capture 、 Standard technique 、 Counting efficiency 、 Analytical chemistry 、 Chemistry 、 Activity measurements 、 Radionuclide 、 Quenching (fluorescence) 、 Sample preparation
摘要: Abstract Beta-emitters 36Cl and 63Ni, the electron capture radionuclide 55Fe were used to calibrate a secondary standardization instrument Quantulus-1220TM. An external standard technique was applied assess quenching level of samples. Nitromethane as an artificial quencher for sample preparation at different levels. The dependence counting efficiency on determined. Samples beta-emitters re-measured with triple-to-double coincidence ratio (TDCR) primary instrument. specific activities determined help software TDCRB-02 compared known values. It found that 63Ni discrepancy 0.9% 2.7%, respectively, within specified uncertainty limits. A new 90Sr prepared measured TDCR device. In this case, divergence from expected value 1.7%. Results suggest suitability techniques low-level counting.
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