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Radiation Protection Dosimetry Advance Access originally published online on July 6, 2006
Radiation Protection Dosimetry 2007 123(1):3-14; doi:10.1093/rpd/ncl074
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The design of a portable cosmic ray three-band neutron detector

S. D. Monk and M. J. Joyce*

Nuclear and Biomedical Engineering Research Group, Department of Engineering, Lancaster University, Lancaster LA1 4YR, UK

* Corresponding author: m.joyce{at}lancaster.ac.uk

Received April 2, 2003, amended November 19, 2003, accepted December 22, 2003


  Abstract

The design of a portable three-band cosmic-ray neutron detector is reported in this article. This instrument has been designed to characterise cosmic ray neutron fields in the upper atmosphere and in cosmic reference field facilities. The design utilises a spherical moderator with a layer of spallation material covering a central 3He proportional counter. The instrument incorporates twelve lithium-coated diodes, six on the outside of the polyethylene layer and six placed within the structure. The dimensions, materials and arrangement of these in the instrument have been optimised with MCNPX to provide a compromise between the requirements of portability and spectral response.


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