Abstract
Technical characteristics of liquid scintillation counting include high counting efficiency, well-defined sample preparation procedures and a high capacity to measure a large number of samples. However, poor resolution and quenching limit the capability of measuring double-labeled samples when the maximum beta-ray energies are close. The simultaneous standardization of 35S and 14C was described in a previous paper, involving an improved spectrum unfolding method. This procedure has been tested with two other types of close maximum beta-energy nuclides: 204Tl and 36Cl have 710 and 763 keV maximum beta-energies respectively, and cannot be standardized simultaneously by double window methods. However, spectral shape differences permit their deconvolution with great accuracy. Both 147Pm and 45Ca (224 and 255 keV maximum beta-energies) have also been standardized. Samples with different quench values and activity ratios have been assayed, and the limitations have been determined.
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