Background of a 'dE + E' Phoswich Detector

摘要

A method for estimating the γ-ray background of a phoswich detector of the "dE + E" type is discussed. The phoswich detector is composed of an outer thin detector and an inner total-absorption detector and is used for β-ray spectrometry. The calculated background of the phoswich detector with an area 40 cm{sup}2 inside 5-cm-thick lead shielding is shown to be 0.095 ± 0.019 counts/s. The contribution of the high-energy background to the total level is 77%.