# 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 ›› 2016, Vol. 27 ›› Issue (3): 58

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### An inversion decomposition method for better energy resolution of NaI(Tl) scintillation detectors based on a Gaussian response matrix

Jian-Feng He 1,2  Yao-Zong Yang 3  Jin-Hui Qu 1  Qi-Fan Wu 2  Hai-Ling Xiao 1  Cong-Cong Yu 4

1. 1 Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Nanchang 330013, China
2 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
3 Jiujiang Power Supply Subsidiary Company of State Grid Jianxi Electronic Power Company, Jiujiang 332000, China
4 Sichuan Integrative Medicine Hospital Sub-health Testing and Evaluation Laboratory, Chengdu 610041, China
• Contact: Jian-Feng He E-mail:hjf_10@yeah.net
• Supported by:

This work was supported by the National Natural Science Foundation of China (Grant No. 11365001), National Major Scientific Equipment Development Projects (Grant No. 041514065), the Educational Commission of Jiangxi Province of China (Grant No. GJJ13464), Plan of Science and Technology of Jiangxi Province (Grant No. 20141BBE50024), and the Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology (Grant No. RGET1316).

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Jian-Feng He, Yao-Zong Yang, Jin-Hui Qu, Qi-Fan Wu, Hai-Ling Xiao, Cong-Cong Yu. An inversion decomposition method for better energy resolution of NaI(Tl) scintillation detectors based on a Gaussian response matrix.Nuclear Science and Techniques, 2016, 27(3): 58
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Abstract:

NaI(Tl) scintillation detectors have been widely applied for gamma-ray spectrum measurements owing to advantages such as high detection efficiency and low price. However, the mitigation of the limited energy resolution of these detectors, which detracts from an accurate analysis of the instrument spectra obtained, remains a crucial need. Based on the physical properties and spectrum formation processes of NaI(Tl) scintillation detectors, the detector response to gamma photons with different energies is represented by photopeaks that are approximately Gaussian in shape with unique full-width-at-half-maximum (FWHM) values. The FWHM is established as a detector parameter based on resolution calibrations and is used in the construction of a general Gaussian response matrix, which is employed for the inverse decomposition of gamma spectra obtained from the detector. The Gold and Boosted Gold iterative algorithms are employed to accelerate the decomposition of the measured spectrum. Tests of the inverse decomposition method on multiple simulated overlapping peaks and on experimentally obtained U and Th radionuclide series spectra verify the practicability of the method, particularly in the low-energy region of the spectrum, providing for the accurate qualitative and quantitative analysis of radionuclides.