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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >Performance of large volume LaBr_3 scintillation detector equipped with specially-designed shield for neutron resonance capture analysis
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Performance of large volume LaBr_3 scintillation detector equipped with specially-designed shield for neutron resonance capture analysis

机译：配有专门设计的屏蔽罩的大容量LaBr_3闪烁探测器的性能，可用于中子共振捕获分析

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摘要

A large-volume (phi 12.0 cmx12.7 cm) LaBr3 scintillation detector equipped with a specially-designed radiation shield was evaluated for neutron resonance capture analysis at the neutron time-of-flight (TOF) facility GELINA. By using the LaBr3 detector with and without the shield, measurements were carried out at a 13-m TOF station with three metallic samples, namely, Ni, Cr, and Fe. In addition, Monte Carlo simulations with Geant4 were performed, and the results were compared with the measurements to analyze the observed energy spectra and TOF spectra. Energy spectra obtained with the shield showed that prompt gamma-ray peaks emitted from each sample can be used to identify the isotopes. Moreover, the signal-to-noise ratios of resonance peaks in a TOF spectrum with the shield were enhanced 1.5-2.5 times in comparison with those without the shield. Furthermore, simultaneous measurements conducted using the three samples demonstrated that the shield employed herein was indispensable for identifying impurities in a composite sample such as particle-like fuel debris.
机译：在中子飞行时间（TOF）设施GELINA，对配备有专门设计的辐射防护罩的大容量（phi 12.0 cmx12.7 cm）LaBr3闪烁探测器进行了评估，以进行中子共振捕获分析。通过使用带屏蔽和不带屏蔽的LaBr3检测器，在13米TOF站对三种金属样品（即Ni，Cr和Fe）进行了测量。此外，用Geant4进行了蒙特卡洛模拟，并将结果与​​测量结果进行了比较，以分析观察到的能谱和TOF谱。用防护罩获得的能谱表明，从每个样品发出的迅速伽马射线峰可用于鉴定同位素。此外，与不具有屏蔽的情况相比，具有屏蔽的TOF频谱中共振峰的信噪比提高了1.5-2.5倍。此外，使用三个样品进行的同时测量表明，本文中使用的防护罩对于鉴定复合样品中的杂质（如颗粒状燃料碎片）是必不可少的。

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