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Characteristics of multi-energy irradiation fields for determining the near-threshold response of fast-neutron personal dosemeters.

Thomas, D J; Taylor, G C (1998) Characteristics of multi-energy irradiation fields for determining the near-threshold response of fast-neutron personal dosemeters. NPL Report. CIRM 10

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Abstract

A measurement of the response function for a neutron personal dosemeter normally involves a very extensive series of measurements with accelerator-produced monoenergetic neutrons. These are expensive, and are often impractical for dosimetry services wishing to investigate their dosemeters, particularly if they are attempting to improve the dosemeter response and wish to investigate the effects of various changes in design or processing. A technique is described whereby the variation of the neutron energy with angle for neutron producing reactions such as 7Li(p,n)7Be and T(p,n)3He is utilized to irradiate a number of dosemeters to a range of energies in a single experiment. This report describes the characteristics, in particular the angular distribution of the fluence, of three fields covering the energy ranges, 101 to 250 ke V, 336 to 565 ke V, and 561 to 1200 ke V, which between them cover the important energy region where fast-neutron personal dosemeters have a threshold in their detection sensitivity, and where detailed information about the response function is particularly important. Note: all uncertainties quoted in this report are estimates of standard (10) uncertainties representing a confidence level of approximately 67%.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CIRM 10
Subjects: Ionising Radiation
Ionising Radiation > Neutron Metrology
Last Modified: 10 Sep 2018 14:08
URI: http://eprintspublications.npl.co.uk/id/eprint/993

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