Improvement of the energy resolution in a pixellated CdZnTe detector using depth sensing based on pulse rise-time correlation
- Authors
- Cho, H. Y.; Lee, C. S.
- Issue Date
- Feb-2016
- Publisher
- IOP PUBLISHING LTD
- Keywords
- Gamma detectors (scintillators, CZT, HPG, HgI etc); Data analysis; Charge transport and multiplication in solid media
- Citation
- JOURNAL OF INSTRUMENTATION, v.11, no.2
- Journal Title
- JOURNAL OF INSTRUMENTATION
- Volume
- 11
- Number
- 2
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/52929
- DOI
- 10.1088/1748-0221/11/02/C02081
- ISSN
- 1748-0221
- Abstract
- In this work we present the pulse rise-time method by using signals from one electrode to determine the interaction depth in a 16-pixellated CdZnTe (CZT) detector manufactured by eV Products. Pulse shapes were theoretically calculated by varing the depth in steps of 0.5 mm with fixing the in-plane position. The electric field in the CZT detector was calculated numericallly by using the weighting potential method. The depth information was extracted by the rise-time correlation using calculations for anode pulse shapes. In order to check the accuracy of the pulse shape calculation, we performed a maximum-likelihood fitting process by comparing measured pulse shapes with calculated ones. The pulse shapes were digitally recorded by using a 64-channel 62.5 MS/s digitizer (v1740B) manufactured by CAEN. Gamma rays emitted from a Na-22 standard source were bombarded on the negatively biased contact of the CZT detector. The low energy tail of a photo peak attributed to the hole trapping in the energy spectrum was corrected by using the rise-time correlation. The energy resolution was improved from 9.3% to 6.5% for the 511-keV photo peak with the T-50 rise-time correlation.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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