True coincidence summing corrections for an extended energy range HPGe detector

Abstract

Calibration of 4π NaI(Tl) detectors with coincidence summing correction using new numerical procedure and ANGLE4 software AIP Advances 7, 035005 (2017) Abstract. True coincidence summing (TCS) effect for natural radioactive families of U-238 and Th-232 represents a problem when an environmental sample with a close source-detector geometry measurement is performed. By using a certified multi-nuclide standard source to calibrate an energy extended range (XtRa) HPGe detector, it is possible to obtain an intensity spectrum slightly affected by the TCS effect with energies from 46 to 1836 keV. In this work, the equations and some other considerations required to calculate the TCS correction factor for isotopes of natural radioactive chains are described. It is projected a validation of the calibration, performed with the IAEA-CU-2006-03 samples (soil and water).

Utilization of different radionuclides for high-energy extended efficiency calibration of a HPGe for improved determination of calcium and sulfur using k0-INAA

“…For a given radionuclide, the magnitude of true coincidence summing (summing in or summing out) is strongly dependent on the peak and total detection e ciencies as well as on the decay scheme of the radionuclide. The true coincidence summing, hence, become signi cant at close detector-to-source distances owing to a greater probability of two or more γ-rays reaching the detector within the resolving time of the detector [11]. In practice, measuring or computing peak and total detection e ciency for a close detector to source distance is cumbersome and complicated and might yield biased results [12].…”