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New Study: Over a Trillion becquerels of Fukushima radiocesium fell on Hawaii

University of Hawai’i at Mānoa, Oct 31, 2017
Fukushima-derived radiocesium fallout in Hawaiian soils… This study estimated the magnitude of cesium deposition in soil, collected in 2015-2016, resulting from atmospheric fallout… Detectable, Fukushima-derived 134Cs inventories ranged from 30 to 630 Bq m-2 and 137Cs inventories ranged from 20 to 2200 Bq m-2… This research confirmed and quantified the presence of Fukushima-derived fallout in the state of Hawai’i in amounts higher than predicted by models and observed in the United States mainland…
The Hawaiian Islands were expected to get minimal, below 10 Bq m-2 or lower, of Fukushima-derived fallout…
Fukushima-derived soil radiocesium concentrations, were greater than anticipated based on model-predicted Pacific atmospheric dispersion rates…
Maximum estimated values of 134Cs fallout on the islands of Hawaii and O’ahu constrained by precipitation and data from sites with less than 70% canopy cover were obtained by linear interpolation of all measured soil cesium concentrations, resulting in 134Cs fallout ranging from < 60 to 1000 Bq m-2 [According to this study, “The Fukushima-derived fallout… 134Cs to 137Cs ratio was 1:1” — therefore 137Cs fallout from Fukushima was also 60 to 1000 Bq m-2, making the total radiocesium 120 to 2000 Bq m-2. Compare this to the study’s previous statement that “The Hawaiian Islands were expected to get minimal, below 10 Bq m-2 or lower, of Fukushima-derived fallout”]…
Using the conservative values and integrating over the whole area with rainfall above 200 mm, we estimate that the island of Hawaii received 1.50 x 10^12 Bq [1.5 Trillion Bq] of 134Cs and 137Cs, each isotope contributing 50%, between March 19 and April 4, 2011…
Atmospheric dispersion models predicted the majority of the plume to travel a more northern route over the Aleutian Islands… however, suggesting that the Fukushima-derived aerosol plume may have taken an alternative southern path. Our radiocesium fallout inventories are comparatively higher than those estimated and measured in North America. Previous research that used whole-water wet deposition to predict ‘its fallout in North America estimated up to 180 Bq m -2 in Alaska, 46 Bq m -2 in California, and 29 Bq m -2 in Washington State…
This is the first study to our knowledge studying Fukushima-derived fallout in the Pacific Islands…
Fukushima-derived radiocesium fallout in Hawaiian soils

November 28, 2017 - Posted by | Fukushima 2017 | , ,

1 Comment »

  1. I am a simple everyday Joe. If you were to break this down into terminology the everyday person could understand it would be appreciated. By reading the article I conclude we were expecting 10B and received 1000B. That is 100 Times more exposure than expected. Is this dangerous? I was trained in terms of Rads. I do know that radioactive cesium is very dangerous.
    As we said in the Army, can you break this down Barney Style, so we can understand.
    Thank you

    Comment by Jerry R. Sodan Sr. | December 4, 2017 | Reply

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