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Proceedings Paper

Position-sensitive scintillation neutron detectors using a crossed-fiber optic readout array
Author(s): Donald P. Hutchinson; Roger K. Richards; David Eugene Holcomb; James A. Ramsey
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Paper Abstract

The Spallation Neutron Source (SNS) under construction at the oak Ridge National Laboratory will be the most important new neutron scattering facility in the United States. Neutron scattering instruments for the SNS will require large area detectors with fast response (< 1 microsecond), high efficiency over a wide range of neutron energies (0.1 to 10 eV), and low gamma ray sensitivity. We are currently developing area neutron detectors based on a combination of 6LiF/ZnS scintillator screens coupled to a wavelength- shifting fiber optic readout array. A 25 X 25-cm prototype detector is currently under development. Initial tests at the High Flux Isotope Reactor have demonstrated good imaging properties coupled with very low gamma ray sensitivity. In addition, we have developed a multi-layer scintillator/fiber detector to replace existing He-3 gas detector tubes for higher speed operation. This detector has demonstrated a neutron detection efficiency of over 75% at a neutron energy of 0.056 eV or about twice thermal. The response time of this detector is approximately 1 microsecond. Details of the design and test results of both detectors will be presented.

Paper Details

Date Published: 1 October 1999
PDF: 4 pages
Proc. SPIE 3769, Penetrating Radiation Systems and Applications, (1 October 1999); doi: 10.1117/12.363669
Show Author Affiliations
Donald P. Hutchinson, Oak Ridge National Lab. (United States)
Roger K. Richards, Oak Ridge National Lab. (United States)
David Eugene Holcomb, Oak Ridge National Lab. (United States)
James A. Ramsey, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 3769:
Penetrating Radiation Systems and Applications
F. Patrick Doty, Editor(s)

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