https://doi.org/10.1140/epjp/s13360-022-03501-0
Regular Article
A peak shape function building and comparison of cadmium zinc telluride detector for gamma-ray spectrum
1
College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, 610059, Chengdu, China
2
School of Computer Science and Engineering, Sichuan University of Science & Engineering, 644005, Yibin, China
3
School of Physical and Electrical Engineering, Sichuan University of Science & Engineering, 644005, Yibin, China
Received:
8
July
2022
Accepted:
15
November
2022
Published online:
1
December
2022
The gamma-ray spectrum recorded by cadmium zinc telluride (CZT) detector has a severe low-energy tailing due to the detector’s poor charge transport properties. It is critical to build a suitable peak shape function model to describe the gamma-ray spectrum from CZT, especially for the overlapping peaks. The Gaussian function is a well-known model for the gamma-ray peak, which is a kind of symmetric curve. Therefore, modifying the Gaussian function is a primary means to solve the asymmetric peak curve. An exponential replacement standard deviation function (ERSD) model was proposed, and a comparison with several other models for the CZT detector was carried out that are the exponential modified Gaussian (EMG) function, Boosted-SAMPO function, hybrid of Gaussian and truncated exponential functions (EGH), polynomial modified Gaussian function (PMG) and algebraic sum of Gaussian and tailed exponential function (Algebra). In the experiments, four gamma-ray sources of Cs-137, Co-60, Eu-152 and U-235 were tested with these functions, and the least-squares method was used to fit the region of interest. It is concluded that the ESRD model proposed in this work has flexibility and offers an excellent ability to resolve overlapping peaks of the CZT detector.
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