In a previous experiment, Otaki's group fed butterfly larvae leaves of the creeping woodsorrel (Oxalis corniculata) with radiation in the thousands of becquerels per kilogram (Bq / kg) gathered near the power plant within a few months after the accident. (sciencemag.org)
A fresh explosion has rocked the nuclear reprocessing plant at Chelyabinsk in Russia, releasing 7.4 million becquerels of radioactivity up a ventil - ation shaft. (newscientist.com)
For comparison, uncontaminated seawater contains only a few Becquerels per cubic meter of cesium. (scientificamerican.com)