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Fukushima radioactive plume to reach US in 3 years
Date:8/28/2013

Tuesday, August 27: The radioactive ocean plume from the 2011 Fukushima nuclear plant disaster will reach the shores of the US within three years from the date of the incident but is likely to be harmless according to new paper in the journal Deep-Sea Research 1.

While atmospheric radiation was detected on the US west coast within days of the incident, the radioactive particles in the ocean plume take considerably longer to travel the same distance.

In the paper, researchers from the Centre of Excellence for Climate System Science and others used a range of ocean simulations to track the path of the radiation from the Fukushima incident.

The models identified where it would likely travel through the world's oceans for the next 10 years.

"Observers on the west coast of the United States will be able to see a measurable increase in radioactive material three years after the event," said one of the paper's authors, Dr Erik van Sebille.

"However, people on those coastlines should not be concerned as the concentration of radioactive material quickly drops below World Health Organisation safety levels as soon as it leaves Japanese waters."

Two energetic currents off the Japanese coast - the Kuroshio Current and the Kurushio Extension are primarily responsible for accelerating the dilution of the radioactive material, taking it well below WHO safety levels within four months.

Eddies and giant whirlpools some tens of kilometres wide and other currents in the open ocean continue this dilution process and direct the radioactive particles to different areas along the US west coast.

"Although some uncertainties remain around the total amount released and the likely concentrations that would be observed, we have shown unambiguously that the contact with the north-west American coasts will not be identical everywhere," said Dr Vincent Rossi.

"Shelf waters north of 45N will experience higher concentrations during a shorter period,
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Contact: Alvin Stone
alvin.stone@unsw.edu.au
61-293-858-953
University of New South Wales
Source:Eurekalert

Page: 1 2

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