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Open-File Report 2011–1277

Fission Products in National Atmospheric Deposition Program—Wet Deposition Samples Prior to and Following the Fukushima Dai-Ichi Nuclear Power Plant Incident, March 8–April 5, 2011

By Gregory A. Wetherbee, Timothy M. Debey, Mark A. Nilles, Christopher M.B. Lehmann, and David A. Gay

Thumbnail of and link to report PDFAbstract

Radioactive isotopes I-131, Cs-134, or Cs-137, products of uranium fission, were measured at approximately 20 percent of 167 sampled National Atmospheric Deposition Program monitoring sites in North America (primarily in the contiguous United States and Alaska) after the Fukushima Dai-Ichi Nuclear Power Plant incident on March 12, 2011. Samples from the National Atmospheric Deposition Program were analyzed for the period of March 8–April 5, 2011. Calculated 1- or 2-week radionuclide deposition fluxes at 35 sites from Alaska to Vermont ranged from 0.47 to 5,100 Becquerels per square meter during the sampling period of March 15–April 5, 2011. No fission-product isotopes were measured in National Atmospheric Deposition Program samples obtained during March 8–15, 2011, prior to the arrival of contaminated air in North America.

First posted February 21, 2012

For additional information contact:

USGS Atmospheric Deposition Program
PO Box 25046
DFC, Bldg 95, MS 401
Lakewood, CO 80225

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Suggested citation:

Wetherbee, G.A., Debey, T.M., Nilles, M.A., Lehmann, C.M.B., and Gay, D.A., 2012, Fission products in National Atmospheric Deposition Program—Wet deposition samples prior to and following the Fukushima Dai-Ichi Nuclear Power Plant incident, March 8–April 5, 2011: U.S. Geological Survey Open-File Report 2011–1277, 27 p.




Fission Products

Summary and Conclusions


References Cited

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