An estimation of properties of two layer composite x-ray detector

A mathematical model of two (Si-Ge) layer energy dispersive x-ray detector is proposed. This model is based on the analysis of radiation and electron transport in the detector and allows estimating detector response function parameters. Using Monthe-Carlo method the probabilities of photon registration in different parts of detector response function are calculated. The detector with first Si layer and second Ge layer and using time anti-coincidence circuit or time coincidence amplitude summing circuit is considered. It is shown that such detector has improved properties: reduction of Ge loss peak and the total absorption peak registration at high energy photon approaching that of Ge detector.