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Radiation Protection Dosimetry Advance Access published online on September 10, 2007
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm018
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Graeme Taylor, National Physical Laboratory. Crown copyright 2007. Reproduced with the permission of the Controller of Her Majesty's Stationery office

RESULTS OF FIELD TRIALS USING THE NPL SIMULATED REACTOR NEUTRON FIELD FACILITY

G. C. Taylor*, D. J. Thomas and A. Bennett

Neutron Metrology Group, DQL, National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK

* Corresponding author: graeme.taylor{at}npl.co.uk

The NPL simulated reactor neutron field facility provides neutron spectra similar to those found in the environs of UK gas-cooled reactors. Neutrons are generated by irradiating a thick lithium-alloy target with monoenergetic protons between 2.5 and 3.5 MeV (depending on the desired spectrum), and then moderated by a 40-cm diameter sphere of heavy water. This represents an extremely soft workplace field, with a mean neutron energy of 25 keV and, more significantly, a mean fluence to ambient dose equivalent conversion coefficient of the order of 20 pSv cm2, ~20 times lower than those of the ISO standard calibration sources 252Cf and 241Am–Be. Results of field trials are presented, including readings from neutron spectrometers, personal dosimeters (active and passive) and neutron area survey meters, and issues with beam monitoring are discussed.


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