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 ›› 2014, Vol. 25 ›› Issue (5): 050202 doi: 10.13538/j.1001-8042/nst.25.050202

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

High-resolution boosted reconstruction of γ-ray spectra

LI Lei, 1, 2 TUO Xian-Guo,1, 3 LIU Ming-Zhe,1, 2 WANG Jun 1, 2   

  1. 1State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
    2Nuclear Technology and Automation Engineering Institute, Chengdu University of Technology, Chengdu 610059, China
    3Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, China
  • Contact: TUO Xian-Guo
  • Supported by:

    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. 2011JTD0013), and Sichuan Province Science and Technology Support Plan (No. 2013FZ0022)

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LI Lei, TUO Xian-Guo, LIU Ming-Zhe, WANG Jun . High-resolution boosted reconstruction of γ-ray spectra.Nuclear Science and Techniques, 2014, 25(5): 050202     doi: 10.13538/j.1001-8042/nst.25.050202

Abstract:

Direct demodulation method (DDM) was applied to reconstruct -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 determined 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.

Key words: Direct Demodulation Method (DDM), Monte Carlo, GEANT4, Reconstruction, Doublets