Abstract
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.
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This work was supported by the National Natural Science Foundation of China (No. 11675075), Youth Talent Project of Hunan Province, China (No. 2018RS3096), Independent Research Project of Key Laboratory of Plasma Physics, CAEP (No. JCKYS2020212006) and Innovation and Entrepreneurship Training Program for College Students of University of South China (No. X2019083)
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Lan, HY., Song, T., Zhang, JL. et al. Rapid interrogation of special nuclear materials by combining scattering and transmission nuclear resonance fluorescence spectroscopy. NUCL SCI TECH 32, 84 (2021). https://doi.org/10.1007/s41365-021-00914-x
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DOI: https://doi.org/10.1007/s41365-021-00914-x