Neutron spectrometer for improved SNM search.

Vance, Andrew L. ; Aigeldinger, Georg

Sandia National Laboratories

关键词: Fission;    Nuclear Materials-Monitoring.;    Modifications;    Capture;    Neutron Spectrometers;   

DOI  :  10.2172/908879
RP-ID  :  SAND2007-1570
RP-ID  :  AC04-94AL85000
RP-ID  :  908879

美国|英语

来源: UNT Digital Library

【 摘 要 】

With the exception of large laboratory devices with very low sensitivities, a neutron spectrometer have not been built for fission neutrons such as those emitted by special nuclear materials (SNM). The goal of this work was to use a technique known as Capture Gated Neutron Spectrometry to develop a solid-state device with this functionality. This required modifications to trans-stilbene, a known solid-state scintillator. To provide a neutron capture signal we added lithium to this material. This unique triggering signal allowed identification of neutrons that lose all of their energy in the detector, eliminating uncertainties that arise due to partial energy depositions. We successfully implemented a capture gated neutron spectrometer and were able to distinguish an SNM like fission spectrum from a spectrum stemming from a benign neutron source.