Abstract
Measurement of the high-level activities of isotopes leads to an increase in spectrometer dead time, and this influences quality analysis. This study confirms a correlation between dead time and photon energy, especially in the low-energy region. Paralyzed and nonparalyzed methods of calculating dead time were applied and compared for the short-lived 223Ra isotope in cases of high activity analysis. A method of multi-channel counting was utilized for dead time analysis for gamma spectrometry system with HPGe detector. 223Ra and its decay products 219Rn and 111Pb, as short-lived isotopes, play a significant role in the identification of variabilities in dead times for various energy windows. The relative dead time obtained in this study exceeded a value of 31% and had an influence on degradation in quality and quantity analyses. Therefore, this effect should be controlled and corrected.
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