Extraction of mean free path of charge carriers in CdZnTe crystals from measured full-energy peaks

被引：18

作者：

Miyajima, S

Sakuragi, H

Matsumoto, M

机构：

[1] Osaka Univ, Grad Sch Med, Course Hlth Sci, Suita, Osaka 5650871, Japan

[2] Osaka Univ, Fac Med, Sch Allied Hlth Sci, Suita, Osaka 5650871, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2002年 / 485卷 / 03期

关键词：

CdZnTe detector; tailing; mean free path; Hecht equation; X-ray spectrometry;

D O I：

10.1016/S0168-9002(01)02126-X

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The mean free path of electrons (lambda(e)) and holes in a CdZnTe crystal were extracted from measured gamma-ray spectra. First, distortion due to Gaussian broadening was unfolded from full-energy peaks in the gamma-ray spectra. As a result, only tailing was left in the unfolded peaks. Second, lambda(e) and lambda(h), were determined by fitting tailing of full-energy peaks in calculated response functions to that in the unfolded gamma-ray spectra. The response functions were calculated using EGS4 with the Hecht equation coded. 2.5 x 10(2) cm for lambda(e) and 5.0 x 10(-2) cm for lambda(h) were obtained in an electric field of 2500 V/cm: the mutau products were found to be 1.0 x 10(-1) cm(2)/V for electrons and 2.0 x 10(-5) cm(2)/V for holes. This method is reasonable to obtain lambda(e) and lambda(h), which are necessary to correct the distortion caused by tailing in X-ray spectra. (C) 2002 Elsevier Science B.V. All rights reserved.

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收藏

页码：533 / 538

页数：6

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