The determination of the depth of localised radioactive contamination by 137Cs and 60Co in sand with principal component analysis

Adams, Jamie and Mellor, Matthew and Joyce, Malcolm (2011) The determination of the depth of localised radioactive contamination by 137Cs and 60Co in sand with principal component analysis. Environmental Science and Technology, 45 (19). pp. 8262-8267. ISSN 0013-936X

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Abstract

A method to determine the depth of buried localized radioactive contamination nonintrusively and nondestructively using principal component analysis is described. The γ-ray spectra from two radionuclides, cesium-137 and cobalt-60, have been analyzed to derive the two principal components that change most significantly as a result of varying the depth of the sources in a bespoke sand-filled phantom. The relationship between depth (d) and the angle (θ) between the first two principal component coefficients has been derived for both cases, viz.where x and y are constants dependent on the shielding material and the γ-ray energy spectrum of the radioactivity in question, and φ is a function of θ. The technique enables the depth of a localized radioactive source to be determined nonintrusively in the range 5 to 50 mm with an accuracy of ±1 mm.

Item Type: Journal Article
Journal or Publication Title: Environmental Science and Technology
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1600
Subjects:
Departments: Faculty of Science and Technology > Engineering
ID Code: 52096
Deposited By: ep_importer_pure
Deposited On: 16 Dec 2011 12:10
Refereed?: Yes
Published?: Published
Last Modified: 15 Jan 2020 07:27
URI: https://eprints.lancs.ac.uk/id/eprint/52096

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