A Comparison of Ionization-Chamber and Liquid-Scintillation Methods for Measurement of Beta Emitters
At the outset it should be remarked that there is no unequivocal general method of comparing the ionization-chamber and liquid scintillation methods for the measurement of beta emitters. For a useful comparison, one must make arbitrary, but reasonable and specific, assumptions, and then carry out calculations in a reliable statistical manner. This is the approach attempted by the authors in this paper. What has been done is to calculate the minimum sample specific activity that could be determined in a 30-min measurement time to a standard deviation of ± 10% for two widely used commercially available measuring systems: the Applied Physics Corporation Vibrating-Reed Electrometer and the Packard Tri-Carb Liquid Scintillation Spectrometer. Consideration is limited to the two most widely used beta-emitting tracer radioisotopes: tritium and C14.
KeywordsLiquid Scintillation Liquid Scintillator Beta Emitter Background Counting Rate Total Liquid Volume
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Liquid Scintillation Method
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