Calculation of the decision threshold in gamma-ray spectrometry using sum peaks

摘要

In the presence of radon daughters, gamma rays from Y-88 with energies at 898.0 keV or 1836.1 keV appear on a high, continuous background or overlap with other peaks. Therefore a calculation of the decision threshold from the sum peak at 2734.1 keV represents a useful alternative, because here the continuous background is low. The decision threshold calculated from this peak can attain a value being comparable to the decision threshold calculated from the gamma-ray peak at 898.0 key. (C) 2015 Elsevier Ltd. All rights reserved.