Experimental and MCNP simulated gamma-ray spectra for the UNCOSS neutron-based explosive detector
Experimental and MCNP simulated gamma-ray spectra for the UNCOSS neutron-based explosive detector
复制标题
DOI：
10.1016/j.nima.2010.11.055
复制
发表时间：
2011-02
影响因子：
1.4
通讯作者：
C. Eleon;B. Pérot;C. Carasco;D. Sudac;J. Obhodas;V. Valković
中科院分区：
文献类型：
--
作者：
C. Eleon;B. Pérot;C. Carasco;D. Sudac;J. Obhodas;V. Valković
在 FP7 UNCOSS 项目（水下沿海海洋测量者）的框架中，其目标是开发一种基于中子的爆炸物探测系统来识别海底的未爆炸弹药 (UXO)，伽马射线探测器的选择对于达到最佳性能至关重要。本文介绍了两种候选探测器：NaI(Tl) 和 LaBr3(Ce) 探测器之间的比较测试，倾向于 3in.×3in。 LaBr3(Ce);因此，确认了之前通过数值模拟进行的选择，因为其具有更高的快速计时特性、光谱分辨率和单位体积效率。该探测器还记录了 14MeV 标记中子束在感兴趣的元素（C、O、N、Al、Fe、Si 和 Ca）上产生的伽马射线光谱，以便将被询问物体的光谱展开为基本贡献。还与使用 MCNPX 计算机代码和 ENDFB/VII.0 核库模拟的伽马射线光谱进行了定性比较，以验证数值模型。使用类似炸药的材料（醋酸铵）进行了额外的定量验证。
In the frame of the FP7 UNCOSS project (Underwater Coastal Sea Surveyor), whose aim is to develop a neutron-based explosive detection system to identify unexploded ordnance (UXO) lying on the sea bottom, the choice of the gamma-ray detector is essential to reach the optimal performances. This paper presents comparative tests between the two candidates: NaI(Tl) and LaBr3(Ce) detectors, in favour to the 3in.×3in. LaBr3(Ce); thus, confirming the choice previously performed by numerical simulation because of its higher fast timing properties, spectral resolution, and efficiency per volume unit. The gamma-ray spectra produced by 14MeV tagged neutron beams on the elements of interest (C, O, N, Al, Fe, Si, and Ca) have also been recorded with this detector in order to unfold the spectrum of the interrogated object into elementary contributions. A qualitative comparison with the gamma-ray spectra simulated with the MCNPX computer code and the ENDFB/VII.0 nuclear library has also been performed to validate the numerical model. An additional quantitative validation has been performed with an explosive-like material (ammonium acetate).