Sorting Methods. On the Johnston Atoll, Bramlitt [29] reports of radiologically contaminated soils being sorted into clean or contaminated constituents, depending on predetermined radiation concentration levels. The sorting takes place on a conveyor belt that travels beneath radiation detectors; the contaminated soil is diverted into a packaging unit and clean soil is reused on the Atoll without restriction. Potentially contaminated soil is processed at a rate of 750 m3/week with a volume reduction between 95 and 99 percent].