Abstract
Time counting optimization in gamma-ray spectrometry was established using four HPGe detectors and four counting geometries. Deionized water samples with a mixed radioactive solution of 133Ba, 134Cs, 106Ru, 137Cs, 65Zn, and 60Co were prepared in volume from 0.1 to 3 L, and measured three times, for all detection systems, and for seven different counting times, ranging from 1,000 to 150,000 s. The obtained results were compared to the reference values from solutions with well-known activity concentrations samples, for minimum detectable amount (MDA) calculation. A counting time of 50,000 s was found to be generally sufficient to reach agreement between the preset and actual counting times.
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