Results of field trials using the NPL simulated reactor neutron field facility |
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Authors: | Taylor G C Thomas D J Bennett A |
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Affiliation: | Neutron Metrology Group, DQL, National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK. graeme.taylor@npl.co.uk |
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Abstract: | 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 cm(2), approximately 20 times lower than those of the ISO standard calibration sources (252)Cf and (241)Am-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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