Journal
APPLIED SURFACE SCIENCE
Volume 253, Issue 12, Pages 5258-5267Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2006.11.050
Keywords
laser; decontamination; uranium; radioactive; cleaning; surface
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Pulsed laser removal of surface contamination of uranyl nitrate and uranium dioxide from stainless steel has been studied. Most of the loosely bound contamination has been removed at fluence levels below 0.5 J cm(-2), leaving about 5% fixed contamination for uranyl nitrate and 15% for uranium dioxide. Both alpha and beta activities are then sufficiently low that contaminated objects can be taken out of a restricted radiation area for re-use. The ratio of beta to alpha activity is found to be a function of particle size and changes during laser removal. In a separate experiment using technetium-99m, the collection of removed radioactivity in the filter was studied and an inventory made of removed and collected contamination. (c) 2006 Elsevier B.V. All rights reserved.
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