Long Range Neutron Detection: A Progress Report

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The detection of neutron sources horn a considerable distance constitutes a problem that must be treated separately from the bulk of other neutron-detection applications. This report analyzes this problem, describes a number of possible approaches, and describes the design and construction of a square-meter detection system using the approach of moderator-free directional neutron detection. Although experimental results are not the focus of this report a few preliminary results are offered in the last section. Both theoretical and preliminary experimental results confirm that usefi.d detection of neutron sources for national-security applications is relatively easy at a distance of 50 meters, yet ... continued below

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Peurrung, A. J.; Kunz, C. L.; Stromswold, D. C.; Reeder, P. L. & Hansen, R. R. September 18, 1998.

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Description

The detection of neutron sources horn a considerable distance constitutes a problem that must be treated separately from the bulk of other neutron-detection applications. This report analyzes this problem, describes a number of possible approaches, and describes the design and construction of a square-meter detection system using the approach of moderator-free directional neutron detection. Although experimental results are not the focus of this report a few preliminary results are offered in the last section. Both theoretical and preliminary experimental results confirm that usefi.d detection of neutron sources for national-security applications is relatively easy at a distance of 50 meters, yet becomes somewhat challenging from a distance of 100 meters. The square-meter detection system designed for this effort was intended to be, in decreasing order of priority, optimally capable of neutron-source detection at 100 meters, lightweight and easy to use, and low in cost. Thus, the majority of design decisions were driven by the need to maximize sensitivity for remote source detection. Several surprises resulted from this design effort. First, we discovered that%, rather than cadmium or gadolinium, must be used as a shielding material. Second, we discovered that a relatively open collimator is best for remote detection. These and other design decisions are described in detail in the third section of this report. The final detector weighs roughly 45 kg and inco~orates hardware with a cost of roughly $1OOK. Of course, lighter or cheaper detection systems could be designed with some reduction in sensitivity. As designed, our l-square-meter moderator-free detection system is expected to be superior to conventional moderate-and-capture detection for some applications.

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  • Other: DE00001400
  • Report No.: PNNL-11995
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/1400 | External Link
  • Office of Scientific & Technical Information Report Number: 1400
  • Archival Resource Key: ark:/67531/metadc625200

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 18, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Dec. 9, 2016, 6:34 p.m.

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Peurrung, A. J.; Kunz, C. L.; Stromswold, D. C.; Reeder, P. L. & Hansen, R. R. Long Range Neutron Detection: A Progress Report, report, September 18, 1998; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc625200/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.