Thomas, D J (2021) Air attenuation corrections for neutron calibrations. NPL Report. IR 58

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Abstract

An analysis of the effects of relative humidity, temperature, and atmospheric pressure on neutron air attenuation at the distances commonly used for calibration of neutron detecting devices at NPL has been performed. The opportunity was taken to use the most up to date cross sections for the various components of air. The effects of humidity variations are completely negligible. Corrections for pressure and density variations are larger, and since they are easily performed should be incorporated in any analysis procedure. New coefficients have been calculated for the linear attenuation coefficients for monoenergetic neutrons as a function of energy at closely spaced intervals, and also for radionuclide source spectra.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	IR 58
Keywords:	Neutron fluence measurement, Neutron air attenuation
Subjects:	Ionising Radiation > Neutron Metrology
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.47120/npl.IR58
Last Modified:	25 Aug 2021 12:57
URI:	https://eprintspublications.npl.co.uk/id/eprint/9269