Response Function Analysis Techniques For Coplanar Grid CdZnTe Detectors

Year
1999
Author(s)
Thomas H. Prettyman - Los Alamos National Laboratory
T. Marks - Los Alamos National Laboratory
Morag K. Smith - Los Alamos National Laboratory
D. G. Pelowitz - Los Alamos National Laboratory
Abstract
Response function analysis techniques are developed for large-volume, coplanar grid CdZnTe detectors. Applications for these detectors include spent fuel attribute testing, holdup measurements, and in-situ analysis of radioactive material. An empirical model for full-energy-peak-shape is presented that treats low-and high-side tailing characteristics of coplanar grid detectors. We find that coplanar grid detectors have a linear variation in peak width with energy. This information is used to develop a five parameter model that gives peak-shape parameters as a function of energy. The model is demonstrated for a spectrum containing peaks distributed over a wide energy range. The Five-parameter model is included in a research code or multi-region spectrum analysis. The code is used for detector characterization, determination of peak areas, and isotopic analysis.