Counting quenched liquid scintillation samples using an outside-the-instrument gamma source and an external standard channels ratio method |
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| Authors: | I T Takahashi F A Blanchard |
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| Affiliation: | 1. Laboratoire Subatech, Groupe Radiochimie, UMR 6457, IN2P3/CNRS/EMN/Université de Nantes, 4, rue Alfred Kastler, BP20722, 44307 Nantes Cedex 3, France;2. Laboratoire Subatech, SMART, UMR 6457, IN2P3/CNRS/EMN/Université de Nantes, 4, rue Alfred Kastler, BP20722, 44307, Nantes Cedex 3, France;1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, 750021, Ningxia, China;2. School of Chemistry and Chemical Engineering, Key Laboratory of Clean Energy Materials Chemistry of Guangdong Higher Education Institutes, Lingnan Normal University, Zhanjiang, 524048, China;3. Frontier Institute of Science and Technology, Xi''an Jiaotong University, Xi''an, 710054, China;1. Andalusian Earth Science Institute, CSIC-Granada University, Armilla, Spain;2. Faculty of Geosciences, Dept. Earth Sciences – Geochemistry, Utrecht University, Utrecht, the Netherlands;3. Department of Mineralogy and Petrology, University of Granada, Granada, Spain;4. Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands;5. Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, Belgium |
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| Abstract: | An external standard channels ratio method which can use a gamma source outside the spectrometer has been developed. The calibration procedure for a 2 mCi Cs137 source is described. The relationship between counting efficiency and the external standard channels ratio is represented by a cubic or quadratic equation fitted by least squares. Once the calibration for a source is established, the same source settings can be used for counting any isotope. Calibration curves which cover a wide quenching range have obtained for H3, C14, and Cl36 samples quenched with chloroform and methyl red. The average dpm determined by this method for some miscellaneous quenched carbon-14 labeled samples had standard deviations less than ±2.5% for replicate samples. The differences between the calculated and supplied dpm of these samples were also less than ±2.5%. |
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