Clustering algorithm with adaptive shaping method for CdZnTe detectors

Author

Nakamura, A. ; Takahashi, H. ; Zhang, L. ; Fukuda, D. ; Ishitsu, T. ; Nakazawa, M. ; Misawa, M. ; Murayama, H.

Author_Institution

Dept. of Quantum Eng., Tokyo Univ., Japan

Volume

49

Issue

6

fYear

2002

fDate

12/1/2002 12:00:00 AM

Firstpage

3295

Lastpage

3299

Abstract

CdZnTe (CZT) detectors are promising detectors, which have many good characteristics such as room temperature operation, reasonable energy resolution, high-detection efficiency to gamma rays, etc. However, energy resolution of CZT is governed by poor mobilities of charge carriers. Many researchers have tried to solve this problem. Among them, a clustering method has been recently proposed which is based on a digital signal processing of preamplifier output waveforms. In this method, we can classify signals according to their shapes and independently treat different shapes. In this paper, we report a new clustering algorithm with adaptive shaping time. The obtained energy resolution for ¹³⁷Cs was improved to 5.4-keV full width at half maximum (FWHM) by applying this method.

Keywords

II-VI semiconductors; cadmium compounds; carrier mobility; digital signal processing chips; gamma-ray detection; high energy physics instrumentation computing; nuclear electronics; preamplifiers; readout electronics; semiconductor counters; 5.4 keV; ¹³⁷Cs; CZT; CdZnTe; FWHM; adaptive shaping method; clustering algorithm; digital signal processing; gamma ray detection; high-detection efficiency; poor charge carrier mobilities; preamplifier output waveforms; reasonable energy resolution; room temperature operation; shaping time; Charge carriers; Clustering algorithms; Clustering methods; Energy resolution; Gamma ray detection; Gamma ray detectors; Gamma rays; Shape; Signal processing algorithms; Temperature;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2002.806227

Filename

1134319