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The Advancement of a Technique Using Principal Component Analysis for the Non-Intrusive Depth Profiling of Radioactive Contamination

Research output: Contribution to journalJournal article

Published

Journal publication date08/2012
JournalIEEE Transactions on Nuclear Science
Journal number4
Volume59
Number of pages5
Pages1448-1452
Original languageEnglish

Abstract

A significant development of the principal component
analysis technique, to non-intrusively infer the depth of the fission
fragment cesium-137, when it is buried under silica sand has
been described. In this paper we describe the advancement of the
technique by further validating it using blind tests for applications
outside of the laboratory, where not only the depth (z) but
also the surface (x,y) location of gamma-ray emitting contamination
is often poorly characterized. Also uncertainty analysis has been
conducted to test the robustness of the technique. At present the
technique has been tested at the point of maximum activity above
the entrained -ray emitting source (where the optimal , location
is known). This is not usually practical in poorly characterized
environments where the detector cannot be conveniently placed at
such an optimal location to begin with and scanning at multiple
points around the region of interest is often required. Using a uniform
scanning time, the point of maximum intensity can be located
by sampling in terms of total count rate, and converging on this optimal
point of maximum intensity