Research of CdZnTe detector based portable energy dispersive spectrometer

Research of CdZnTe detector based portable energy dispersive spectrometer 1 first-author 1 1 1 1 1 1 Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800, China Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800, China 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. CdZnTe detector Preamplifier Energy-dispersive spectrometer Spectrum analysis References Jenkins R . X-ray techniques: Overview, encyclopedia of analytical chemistry , Chichester : John Whley & Sons Ltd , 2000 : 13269 - 13288 X-ray techniques: Overview, encyclopedia of analytical chemistry Li Longxia , Lu Fengying , The large-size single crystals of CdZnTe growth at Yinnel Tech , DOE-NN-20 Review March1st , 2001 , SNL , Albuquerque . The large-size single crystals of CdZnTe growth at Yinnel Tech Cooley J W ., Tukey O W . Math. Comput . 1965 , 19 : 297 - 301 . Math. Comput Press W H , Flannery B P , Teukolsky S A , et al , Numerical derivatives . Cambridge, England : Cambridge University Press , 1992 : 180 - 184 . Numerical derivatives CHENG Cheng , WEI Yongbo , JIANG Dazhen . Nuclear Science and Techniques , 2005 , 16 ( 3 ): 167 - 170 Nuclear Science and Techniques 10.1016/S1001-8042(06)60021-3 TL817.1 2005-11-07 2006-04-20 2021-01-19 2006 Nuclear Science and Techniques 02 17