Design and Testing of a Position-Sensitive Plastic Scintillator Detector for Fast Neutron Imaging

We describe the design and performance of a position sensitive scintillator detector developed for neutron measurements. Several of these detectors are to be used in the assembly of the Fast Neutron Imaging Telescope (FNIT), an instrument with imaging and energy measurement capabilities, sensitive t...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2006-12, Vol.53 (6), p.3894-3903
Main Authors: Bravar, Ulisse, Bruillard, Paul J., Flckiger, Erwin O., Macri, John R., McConnell, Mark L., Moser, Michael R., Ryan, James M., Woolf, Richard S.
Format: Article
Language:English
Subjects:
Assembly
Atoms & subatomic particles
Detectors
Elastic scattering
Energy (nuclear)
Energy measurement
Energy use
Fast neutrons
Homeland security
Imaging
Instruments
Neutron imaging
neutron spectroscopy
Neutrons
Plastics
Position measurement
Position sensitive particle detectors
Scattering
scintillation detectors
Telescopes
Testing
wavelength-shifting (WLS) fibers
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Summary:We describe the design and performance of a position sensitive scintillator detector developed for neutron measurements. Several of these detectors are to be used in the assembly of the Fast Neutron Imaging Telescope (FNIT), an instrument with imaging and energy measurement capabilities, sensitive to neutrons in the 2-20 MeV energy range. FNIT was initially conceived to study solar neutrons as a candidate instrument for the Inner Heliospheric Sentinels (IHS) program under formulation at NASA. It is now being adapted to locate Special Nuclear Material (SNM) for homeland security purposes by detecting fission neutrons and reconstructing the image of their source. The detection principle is based on multiple elastic neutron-proton scatterings in organic scintillator. The detector presented here utilizes wavelength-shifting (WLS) fibers, grooved into the plastic scintillator and read out by multianode photomultiplier tubes (MAPMTs) to determine scattering locations. By also measuring the recoil proton and scattered neutron's energies, the direction and energy spectrum of incident neutrons can be determined and discrete sources identified
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2006.886046