Assessment of LaBr3(Ce) scintillators system for measuring nuclear resonance fluorescence excitations near 2 MeV

Assessment of LaBr3(Ce) scintillators system for measuring nuclear resonance fluorescence excitations near 2 MeV
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用于测量近 2 MeV 核共振荧光激发的 LaBr3(Ce) 闪烁体系统的评估

DOI:
10.1109/nssmic.2011.6154648
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发表时间:
2011
期刊:
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE、2011
影响因子:
--
通讯作者:
H. Toyokawa 、
H. Toyokawa 、
中科院分区:
--
文献类型:
--
作者:
M. Omer;M. Bakr;R. Kinjo;Y.W. Choi;K. Yoshida;N. Kimura;K. Ishida;T. Komai;M. Shibata;K. Shimahashi;H. Imon;T. Sonobe;T. Kii;K. Masuda;H. Ohgaki;R. Hajima;T. Hayakawa;T. Shizuma;H. Toyokawa 、

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核共振荧光(NRF)是核材料非破坏性分析的有力工具。探测系统是利用该技术研究核材料的关键问题。长期以来,使用Ge探测器是因为它们具有优异的能量分辨率,但也具有成本高和响应时间慢的缺点。而LaBr3(Ce)探测器响应速度快、探测效率高、易于组装。然而,LaBr3(Ce)晶体的缺点来自不可避免的接近2MeV的内部背景能级。该制度具有重要意义,因为它是非常丰富的235 U和239 Pu水平。我们用国家先进工业科学和技术研究所(AIST)的激光康普顿背散射(LCS)的2.13 MeV准单色γ射线束测试了两个不同的体积闪烁器。我们可以清楚地探测到2.13MeV的11B的NRF激发能级。对于该能级,小型LaBr3(Ce)探测器的能量分辨率为1.8%(FWHM),大型LaBr3(Ce)探测器的能量分辨率为2.4%(FWHM)。根据我们的研究结果,讨论了这种闪烁体用于核材料鉴定的非破坏性分析的潜力。
Nuclear resonance florescence (NRF) is a powerful tool for non-destructive assaying of nuclear materials. Detection system is a key issue for investigating nuclear materials using this technique. For a long time, Ge detectors were used because they have an excellent energy resolution but also have drawbacks of high cost and slow response time. On the other hand, LaBr3(Ce) detectors have high response speed and high detection efficiency as well as easy for assembly. However, a drawback of LaBr3(Ce) crystals comes from the unavoidable internal background levels near 2 MeV. This regime has great importance because it is very rich with235U and239Pu levels. We tested two different volume scintillators with 2.13 MeV quasi-monochromatic gamma-ray beam from the laser Compton backscattering (LCS) in National Institute of Advanced Industrial Science and Technology (AIST). We could clearly detect the NRF excitation level from11B at 2.13 MeV. For this level, the energy resolution for the small LaBr3(Ce) detector was 1.8% (FWHM), and 2.4% (FWHM) for the large LaBr3(Ce) detector. Potential of this scintillator for non-destructive assay of nuclear material identification is discussed in the light of our results.
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