Portland-area had highest Iodine-131 deposition in US at 5,100 Bq/m² by April 5 -Gov’t Study

Published: February 23rd, 2012 at 8:48 am ET
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Title: 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
Source: U.S. Department of the Interior, U.S. Geological Survey
Authors: Gregory A. Wetherbee, Timothy M. Debey, Mark A. Nilles, Christopher M.B. Lehmann, and David A. Gay
Date: Feb. 21, 2012
Emphasis Added

I-131 was quantified and adjusted for decay to the time of sample collection for five whole-water wet-deposition samples from California, Colorado, and Washington. The activities of the quantified I-131 ranged from 29.6 to 1,090 pCi/L, and calculated deposition values ranged from 211 to 5,100 Bq/m2. Several weeks transpired between sample collection and analysis of the I-131 in the water samples, which were prioritized for analysis from west (high priority) to east (low priority). Therefore, I-131 activities likely decayed in most of the samples before they could be measured.

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Published: February 23rd, 2012 at 8:48 am ET
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