Abstract
A method is described for computing the liquid-scintillation counting efficiency for isomeric-transition radionuclides. The counter efficiency is traced using standards of the low-energy β-particle emitter 3H. The method is applied to the standardization of 6-h 99mTc. The two-phototube coincidence counting efficiency is computed as 0.28, with an uncertainty (one standard deviation) of 3.4%. A simple and accurate secondary-standardization technique is also demonstrated, which is based on measurements of a full-energy peak at 119–140 keV. The computed detection efficiency for this full-energy peak is 0.109, which compares well with measured values of 0.110 and 0.112 for two commercial spectrometers. Effects due to γ-ray interactions in the scintillators and ionization quenching for low-energy electrons are also discussed.
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Schedule a callMore From: International Journal of Radiation Applications & Instrumentation. Part A, Applied Radiation & Isotopes
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