Professor Kai Vetter of the Department of Nuclear Engineering at the University of California at Berkeley kneels beside a germanium detector which is used to identify radioactive airborne particulates... more 
Professor Kai Vetter of the Department of Nuclear Engineering at the University of California at Berkeley kneels beside a germanium detector which is used to identify radioactive airborne particulates in a filter taken from air samples Friday, March 18, 2010, in Berkeley, Calif. Air pollution regulators in Southern California say they have not detected increased levels of radiation from the damaged Japanese nuclear reactors. The South Coast Air Quality Management District said Friday radiation measured at its three sites are not higher than typical levels. (AP Photo) less 
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Associated Press
Sun, Mar 20, 2011 9:27 PM EDT