Thomas, D; Ward, K (2024) Average distances and angles for radiation arriving at a measurement point from a circular source area. NPL Report. IR 68

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Abstract

A determination of the intensity and average angle of incidence for radiation from a surface source at a point away from the surface involves the integration of distances and angles over the area of the source. This report derives the equations for performing these calculations for a circular source. A Fortran program that can be used for performing these calculations is described, and results are presented for average distances, relative intensities, and angles for the radiation in the NPL thermal column where the source is a circular area at the bottom of a vertical column.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	IR 68
Keywords:	Neutron irradiations, Angle dependence of radiation fields
Subjects:	Ionising Radiation > Neutron Metrology
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.47120/npl.IR68
Last Modified:	28 Jan 2025 09:55
URI:	https://eprintspublications.npl.co.uk/id/eprint/10111