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High-resolution boosted reconstruction of γ-ray spectra

ISSN号：1001-8042
期刊名称：Nuclear Science and Techniques
时间：2014
页码：050202-1-050202-7
分类：TP301.6[自动化与计算机技术—计算机系统结构;自动化与计算机技术—计算机科学与技术] U666.7[交通运输工程—船舶及航道工程;交通运输工程—船舶与海洋工程]
作者机构：[1]State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China, [2]Nuclear Technology and Automation Engineering Institute,Chengdu University of Technology, Chengdu 610059, China, [3]Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, China
相关基金：Supported by National Science Foundation for Distinguished Young Scholars （No. 41025015）, Natural Science Foundation of China （No. 41274130）, Sichuan Youth Science and Technology Innovation Team （No. 201 IJTD0013）, and Sichuan Province Science and Technology Support Plan （No. 2013FZ0022）
相关项目：核地球物理勘探技术仪器开发及应用研究

关键词：高分辨率, 线谱, 伽玛能谱仪, 蒙特卡罗方法, 相对误差, 频谱分析方法, DDM, 响应矩阵, Direct Demodulation Method （DDM）, Monte Carlo, GEANT4, Reconstruction, Doublets

中文摘要：

Direct demodulation method(DDM) was applied to reconstruct γ-ray spectra. Boosted Richardson-Lucy iteration was introduced into DDM. Monte Carlo method(here GEANT 4) was proposed to calibrate response function and establish response matrix. First, gauss function was regarded as total energy peak. Spectra line was simulated with nine gauss functions. And afterwards DDM was applied to reconstruct the simulated spectra line and determine peak positions and areas. Compared with original spectra, for case that peak position interval was about 1/3 full width half maximum(FWHM), the error of rebuilding peak position was 2 channels. The rest of peaks could be searched accurately. The relative errors of all peaks’ area were less than 4%. Then, three key factors, including noise, background, response matrix, were discussed. Finally, DDM was applied to calibrate the field NaI gamma spectrometer. The errors of U, Th, K were less than 5%. Comprehensive studies have shown that it is feasible to reconstruct gamma-ray spectra with DDM. DDM can significantly pseudo-improve energy resolution of gamma spectrometer, effectively decompose doublets whose peak potential interval is1/3 FHWM, and accurately search peak and calculate areas. DDM can restrain noise strongly but is greatly influenced by background. And DDM can improve the accuracy of qualitative and quantitative analysis in combination with the conventional spectrum analysis method.更多还原

英文摘要：

Direct demodulation method （DDM） was applied to reconstruct T-ray spectra. Boosted Richardson-Lucy iteration was introduced into DDM. Monte Carlo method （here GEANT 4） was proposed to calibrate response function and establish response matrix. First, gauss function was regarded as total energy peak. Spectra line was simulated with nine gauss functions. And afterwards DDM was applied to reconstruct the simulated spectra line and determine peak positions and areas. Compared with original spectra, for case that peak position interval was about 1/3 full width half maximum （FWHM）, the error of rebuilding peak position was 2 channels. The rest of peaks could be searched accurately. The relative errors of all peaks＇ area were less than 4%. Then, three key factors, including noise, background, response matrix, were discussed. Finally, DDM was applied to calibrate the field NaI gamma spectrometer. The errors of U, Th, K were less than 5%. Comprehensive studies have shown that it is feasible to reconstruct gamma-ray spectra with DDM. DDM can significantly pseudo-improve energy resolution of gamma spectrometer, effectively decompose doublets whose peak potential interval is 1/3 FHWM, and accurately search peak and calculate areas. DDM can restrain noise strongly but is greatly influenced by background. And DDM can improve the accuracy of qualitative and quantitative analysis in combination with the conventional spectrum analysis method.

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