HPGe detector absolute full-energy peak efficiency calibration including coincidence correction for circular disc sources

摘要

A direct mathematical approach is presented to calculate the absolute full-energy peak (photopeak) efficiency and coincidence correction of hyper pure germanium (HPGe) detectors for extended circular disc sources. The calculation of the full-energy peak efficiency is based on elliptic integration and its validity was checked by comparison with experimental measurements. Extensive experimental readings have been carried out; gamma sources containing several radionuclides covering the energy range from 60 to 1836 keV were used. By comparison, the theoretical and experimental full-energy peak efficiency values are in good agreement; the overall percentage error is less than 3%.