Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2006, Vol. 17 ›› Issue (2): 106 doi: 10.1016/S1001-8042(06)60021-3

• ADVANCED NUCLEAR INSTRUMENTATION AND DETECTION • Previous Articles     Next Articles

Research of CdZnTe detector based portable energy dispersive spectrometer

CHENG Cheng WEI Yong-Bo XU Hui-Chao ZHAO Cui-Lan ZHANG Jin-Zhou PU Shi-Jie JIANG Da-Zhen   

  1. Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800, China
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CHENG Cheng WEI Yong-Bo XU Hui-Chao ZHAO Cui-Lan ZHANG Jin-Zhou PU Shi-Jie JIANG Da-Zhen. Research of CdZnTe detector based portable energy dispersive spectrometer.Nuclear Science and Techniques, 2006, 17(2): 106     doi: 10.1016/S1001-8042(06)60021-3
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Abstract: 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 computer via USB bus. Data process algorithms are improved in this spectrometer. Fast Fourier transform (FFT) and numerical 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.

Key words: CdZnTe detector, Preamplifier, Energy-dispersive spectrometer, Spectrum analysis