Modeling of the stacked gamma-ray detectors

A didactic approach has been presented for the understanding of operation of the stacked or series combination of gamma-ray detectors. Assuming isotropic scattering of gamma-rays, we have obtained expressions for the addback factor in terms of only one probability. Using the experimental data of the HHS spectrometer, we have predicted the addback factor for various stacked detectors. This generalised technique could be used to predict the performance parameters of a stacked detector with any number of elements. Other than simulation studies, we present an intuitive way of understanding the operation of series detectors.