Home > Research > Publications & Outputs > The determination of the depth of localised rad...
View graph of relations

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

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>2011
<mark>Journal</mark>Environmental Science and Technology
Issue number19
Number of pages6
Pages (from-to)8262-8267
<mark>Original language</mark>English


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.