# 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 (4): 101

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### An inversion decomposition test based on Monte Carlo response matrix on the γ-ray spectra from NaI(Tl) scintillation detector

Jian-Feng He 1,2, Qi-Fan Wu1 , Jian-Ping Cheng1, Fang Fang3, Yao-Zong Yang4, Jin-Hui Qu 2

1. 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2 Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology Nanchang, Jiangxi 330013, China
3 College of Information Sciences and Technology, Chengdu University of Technology, Chengdu 610059, China
4 Jiujiang Power Supply Subsidiary Company of State Grid Jiangxi Electronic Power Company, Jiujiang 332000, China
• Contact: Jian-Feng He E-mail:hjf_10@yeah.net
• Supported by:

This work is supported by National Natural Science Foundation of China (No. 11365001), National Major Scientific Equipment Development Projects (No. 041514065), Natural Science Foundation of Jiangxi (No. 20161BAB201035), and Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology (No. RGET1316).

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Jian-Feng He, Qi-Fan Wu, Jian-Ping Cheng, Fang Fang, Yao-Zong Yang, Jin-Hui Qu. An inversion decomposition test based on Monte Carlo response matrix on the γ-ray spectra from NaI(Tl) scintillation detector.Nuclear Science and Techniques, 2016, 27(4): 101
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Abstract:

The NaI(Tl) scintillation detector has a number of unique advantages, including wide use, high light yield, and its low price. It is difficult to obtain the decomposition of instrument response spectrum because of limitations associated with the NaI(Tl) scintillation detector’s energy resolution. This paper, based on the physical process of γ photons released from decay nuclides, generating an instrument response spectrum, uses the Monte Carlo method to simulate γ photons with NaI(Tl) scintillation detector interaction. The Monte Carlo response matrix is established by different single energy γ-rays with detector effects. The Gold and the improved Boosted-Gold iterative algorithms have also been used in this paper to solve the response matrix parameters through decomposing tests, such as simulating a multi-characteristic energy γ-ray spectrum and simulating synthesized overlapping peaks γ-ray spectrum. An inversion decomposition of the γ instrument response spectrum for measured samples (U series, Th series and U–Th mixed sources, among others) can be achieved under the response matrix. The decomposing spectrum can be better distinguished between the similar energy characteristic peaks, which improve the error levels of activity analysis caused by the overlapping peak with significant effects.