Calibration and simulation of a coded aperture neutron imaging system

Coded aperture neutron imaging detectors have the potential to be a powerful tool for the detection of special nuclear material at long range or under heavy shielding, using the signature of fast neutrons from spontaneous fission. We are building a prototype system using liquid scintillator cells, m...

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Bibliographic Details
Main Authors: Brubaker, E., Brennan, J., Hilton, N., Marleau, P., Steele, J.
Format: Conference Proceeding
Language:English
Subjects:
Apertures
Calibration
Energy resolution
Gamma ray detection
Gamma ray detectors
Neutrons
Prototypes
Pulse shaping methods
Shape
Testing
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Description
Summary:Coded aperture neutron imaging detectors have the potential to be a powerful tool for the detection of special nuclear material at long range or under heavy shielding, using the signature of fast neutrons from spontaneous fission. We are building a prototype system using liquid scintillator cells, measuring 20" × 2.5" × 2.5" each, in a reconfigurable arrangement. A cross-calibration of the observed detector data with the output of Monte Carlo simulation can both improve the sensitivity of the detector to fast neutron sources and increase the simulation accuracy, allowing the study of next-generation detector designs. Here we describe the tools and procedures developed to calibrate and simulate the detector response, including energy scale and resolution, interaction position, and gamma-neutron separation using pulse shape discrimination. Detector data and simulation are in good agreement for a test configuration.
ISSN:1082-3654
2577-0829
DOI:10.1109/NSSMIC.2009.5401564