While the results did not detect dark matter particles — known as «weakly interacting massive particles» or «WIMPs» — the combination of record low radioactivity levels with the size of the detector implies an excellent discovery potential in the years to come. (sciencedaily.com)
«U.S. Alerts Tribe to Foul Water - Radioactivity Levels in River May Imperil Livestock of Navajos,» Arizona Republic, p. B - 1, October 7, 1986. (sric.org)
This investigation is examining multiple unplanned shutdowns, a transformer fire that triggered the declaration of an unusual event level emergency, and most recently, a radioactive tritium leak that has caused groundwater radioactivity levels to rise more than 65,000 percent. (newrochelletalk.com)