科技报告详细信息
Methods and Instruments for Fast Neutron Detection
Jordan, David V. ; Reeder, Paul L. ; Cooper, Matthew W. ; McCormick, Kathleen R. ; Peurrung, Anthony J. ; Warren, Glen A.
Pacific Northwest National Laboratory (U.S.)
关键词: Fast Neutrons;    Phosphors;    Neutron Flux;    Neutrons;    Detection;   
DOI  :  10.2172/1018168
RP-ID  :  PNNL-15214
RP-ID  :  AC05-76RL01830
RP-ID  :  1018168
美国|英语
来源: UNT Digital Library
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【 摘 要 】

Pacific Northwest National Laboratory evaluated the performance of a large-area (~0.7 m2) plastic scintillator time-of-flight (TOF) sensor for direct detection of fast neutrons. This type of sensor is a readily area-scalable technology that provides broad-area geometrical coverage at a reasonably low cost. It can yield intrinsic detection efficiencies that compare favorably with moderator-based detection methods. The timing resolution achievable should permit substantially more precise time windowing of return neutron flux than would otherwise be possible with moderated detectors. The energy-deposition threshold imposed on each scintillator contributing to the event-definition trigger in a TOF system can be set to blind the sensor to direct emission from the neutron generator. The primary technical challenge addressed in the project was to understand the capabilities of a neutron TOF sensor in the limit of large scintillator area and small scintillator separation, a size regime in which the neutral particle’s flight path between the two scintillators is not tightly constrained.

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