Integrated absolute full energy peak efficiency: a measure of photon registration efficiency

Abstract

Abstract Integrated absolute full energy peak efficiency (IAFEPE) is the measure of photon registration efficiency by means of the γ-ray spectrometry method. For the first time, we derive appropriate formulas and theoretical explanations of IAFEPE. IAFEPE is a definite integral (Riemann integral) of the photon registration efficiency function within the detection energy range. IAFEPE, in common with associated quantities, i.e., mass integrated absolute full energy efficiency (MIAFEPE) and surface integrated absolute full energy peak efficiency (SIAFEPE), allows for the quantitative validation of measurement conditions in terms of finding the best solution and for several analytical considerations previously unavailable. MIAFEPE is the product of sample mass and IAFEPE, while SIAFEPE represents the product of surface area and IAFEPE. They both consider changes in the count rate due to the total activity of a sample. In applied neutronics and radiation monitoring, we successfully used IAFEPE and derivative quantities to validate the correctness of the measurement process. The IAFEPE, MIAFEPE, and SIAFEPE allow the selection of the proper measurement conditions before starting measurements. Thus, for planning spectrometry, knowledge about sample activity in most cases is no longer needed.