Title: Measurement of Radioactive Fallout from the March 2011 Fukushima Nuclear Reactor Incident
Source: U.S. Geological Survey (USGS) in collaboration with the National Atmospheric Deposition Program
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The U.S. Geological Survey (USGS) collaborated with the National Atmospheric Deposition Program in an effort to monitor North American precipitation samples for the presence of nuclear fallout in response to the Japan Fukushima Dai-ichi Nuclear Power Station incident that occurred on March 11, 2011. [...]
The study found concentrations (activity) and fallout (deposition) of radioactive iodine and radioactive cesium in significant number of samples. Detectable quantities of Iodine-131, Cesium-137, and Cesium-134 were observed at 21% of the 167 tested locations. Concentrations of I-131 detected in 5 samples ranged from 29.6 to 1090 picocuries per liter (pCi/L). Concentrations of Cs-134 detected in 23 samples ranged from 0.4 to 55 pCi/L. Concentrations of Cs-137 in 33 samples ranged from 0.70 pCi/L to 39 pCi/L.
Detections and measurable fallout from wet deposition was observed primarily at NADP sites located along the West Coast of the US, the central Rocky Mountain region and northern Great Plains, the central and upper Mississippi River Valley and eastern mountainous regions ranging from Virginia northward through Vermont. [...]
While the USGS does not assess human health risks from exposure to radioactive fallout, the United States Environmental Protection Agency’s RadNet confirms that radiation levels in the United States were far below the level of concern for human health impact. [...]
Published: January 3rd, 2013 at 3:22 pm ET