Research of CdZnTe detector based portable energy dispersive spectrometer

被引：2
|
作者：
CHENG Cheng WEI Yong-Bo XU Hui-Chao ZHAO Cui-Lan ZHANG Jin-Zhou PU Shi-Jie JIANG Da-Zhen (Shanghai Institute of Applied Physics
机构：
来源：
Nuclear Science and Techniques | 2006年 / 02期
关键词：
CdZnTe detector; Preamplifier; Energy-dispersive spectrometer; Spectrum analysis;
D O I：
暂无
中图分类号：
TL817 [谱仪];
学科分类号：
082704 ;
摘要：
A kind of excellent CdZnTe crystal has been grown in Yinnel Tech, Inc. in recent years. Based on these CdZnTe crystals and some new techniques, a portable energy-dispersive spectrometer has been constructed which has yielded good results. CdZnTe detector has a 3% relative resolution in high-energy field and can detect gamma rays at room temperature. An integrated circuit based on preamplifier and shaping amplifier chips is connected to the detector. Voltage pulses are transformed into digital signals in MCA (multichannel analyzer) and are then transmitted to com- puter via USB bus. Data process algorithms are improved in this spectrometer. Fast Fourier transform (FFT) and nu- merical differentiation (ND) are used in energy peak’s searching program. Sampling-based correction technique is used in X-ray energy calibration. Modified Gaussian-Newton algorithm is a classical method to solve nonlinear curve fitting problems, and it is used to compute absolute intensity of each detected characteristic line.
引用
收藏
页码：106 / 112
页数：7
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