摘要:
A compact broadband Compton spectrometer with high spectral resolution has been designed to detect spectra of laser-driven high-flux gamma rays. The primary detection range of the gamma-ray spectrum is 0.5 MeV–13 MeV, although a secondary harder gamma-ray region of 13 MeV–30 MeV can also be covered. The Compton-scattered electrons are spectrally resolved using a curved surface detector and a nonuniform magnetic field produced by a pair of step-like magnets. This design allows a compact structure, a wider bandwidth, especially in the lower-energy region of 0.5 MeV–2 MeV, and optimum spectral resolution. The spectral resolution is 5%–10% in the range 4 MeV–13 MeV and better than 25% in the range 0.5 MeV–4 MeV (with an Al converter of 0.25 mm thickness and a collimator of 1 cm inner diameter). Low-Z plastic materials are used on the inner surface of the spectrometer to suppress noise due to secondary X-ray fluorescence. The spectrometer can be adjusted flexibly via a specially designed mechanical component. An algorithm based on a regularization method has also been developed to reconstruct the gamma-ray spectrum from the scattered electrons.
作者机构:
[Lan, Hao-Yang; Zhang, Jia-Lin; Song, Tan; Zhou, Jian-Liang; Luo, Wen] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Luo, Wen] Univ South China, Natl Exemplary Base Int Sci & Tech, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.
通讯机构:
[Wen Luo] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>National Exemplary Base for International Sci. & Tech., Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang, China
关键词:
Special nuclear material;Nondestructive interrogation;Nuclear resonance fluorescence
摘要:
The smuggling of special nuclear materials (SNMs) across national borders is becoming a serious threat to nuclear nonproliferation. This paper presents a feasibility study on the rapid interrogation of concealed SNMs by combining scattering and transmission nuclear resonance fluorescence (sNRF and tNRF) spectroscopy. In sNRF spectroscopy, SNMs such as
$$^{235, 238}$$
U are excited by a wide-band photon beam of appropriate energy and exhibit unique NRF signatures. Monte Carlo simulations show that one-dimensional scans can realize isotopic identification of concealed
$$^{235, 238}$$
U when the detector array used for interrogation has sufficiently high energy resolution. The simulated isotopic ratio
$$^{235}$$
U/
$$^{238}$$
U is in good agreement with the theoretical value when the SNMs are enclosed in relatively thin iron. This interrogation is followed by tNRF spectroscopy using a narrow-band photon beam with the goal of obtaining tomographic images of the concealed SNMs. The reconstructed image clearly reveals the position of the isotope
$$^{235}$$
U inside an iron rod. It is shown that the interrogation time of sNRF and tNRF spectroscopy is one order of magnitude lower than that when only tNRF spectroscopy is used and results in a missed-detection rate of 10
$$^{-3}$$
. The proposed method can also be applied for isotopic imaging of other SNMs such as
$$^{239, 240}$$
Pu and
$$^{237}$$
Np.
作者机构:
[徐士坤; 于涛; 谢金森; 姚磊] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hengyang;[李满仓; 夏羿] Nuclear Power Institute of China, Chengdu;610213, China
作者机构:
[杨超; 于涛] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[邓力; 程汤培] CAEP Software Center for High Performance Numerical Simulation, Beijing;100094, China;[杨超; 于涛] 421001, China
作者机构:
[雷济充; 谢金森; 于涛; 陈珍平; 赵鹏程; 谢超; 倪梓宁] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;Virtual Simulation Experiment Teaching Center on Nuclear Energy and Technology, University of South China, Hengyang;[周剑东] Shanghai Nuclear Engineering Research and Design Institute Co., Ltd., Shanghai;200000, China
作者机构:
[刘劲; 吴雨田; 邓爽; 肖静水; 彭安国] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[刘广山; 李超] College of the Environment and Ecology, Xiamen University, Xiamen, 361005, China
通讯机构:
[Peng, A.] S;School of Nuclear Science and Technology, China
作者机构:
[姚鑫森] Radiotherapy Center, Chenzhou First People's Hospital, Chenzhou 423000, China;[巩贯忠; 尹勇] Department of Radiation Physics, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, China;[任建新] School of Physics and Technology, Wuhan University, Wuhan 430072, China;[左国平] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
通讯机构:
[Yong, Y.] D;Department of Radiation Physics, China
作者:
Wan Shun-kuan;Lu Bo;Zhang Hong-ming*;He Liang;Fu Jia;...
期刊:
光谱学与光谱分析,2021年41(10):3111-3116 ISSN:1000-0593
通讯作者:
Zhang Hong-ming
作者机构:
[Lu Bo; Fu Jia; Wan Shun-kuan; Wang Fu-di; Zhang Hong-ming; Li Yi-chao; Bin Bin; He Liang] Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China.;[Wan Shun-kuan; Li Yi-chao] Univ Sci & Technol China, Hefei 230026, Peoples R China.;[Ji Hua-jian] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
作者机构:
[姜庆丰; Zeng, Wenjie; 于涛; 谢金森; 陈乐至] School of Nuclear Science and Technology, University of South China, Hengyang;Hunan;421001, China;[姜庆丰; Zeng, Wenjie; 于涛; 谢金森; 陈乐至] Hunan;[姜庆丰; Zeng, Wenjie; 于涛; 谢金森; 陈乐至] 421001, China
作者机构:
[姜庆丰; Zeng, Wenjie] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[姜庆丰; Zeng, Wenjie] 421001, China
通讯机构:
School of Nuclear Science and Technology, University of South China, Hengyang, China