PNNL

Abstract

Digital pulse processing technique was implemented to determine electron mobility, mu e, and electron mobility life time product, mu e T e, in Cadmium Zinc Telluride Detectors (CZT). The Digital Gamma Finder (DGF-4C), single width CAMAC module, produced by X-ray Instrumentation Associates (XIA) was used to extract pulse height, pulse shape, and signal rise time information. Signal ballistic deficit correction feature of the DGF-4C was the incentive to measure the mu e and mu e Te in selected CZT samples. An almost linear relationship was observed for the signal rise time as a function of the inverse bias. This observed linear relationship was the basis for the mu e determination using a simple linear fit. The measured signal amplitude was also used to determine the mu e Te using the Hecht formulation. Repeated measurements carried out confirmed the consistency of the method in mu e and mu e Te determination.