Scientists:
Test West Coast for Fukushima radiation
In Oregon, state park rangers take quarterly samples of surf water and sand at three locations along the coast. The water is analyzed for Cesium 137 and iodine 131. Both of those already exist in the ocean at low levels from nuclear testing decades ago.
9
March, 2014
SALEM,
Ore. -- Very low levels of radiation from the Fukushima nuclear
disaster likely will reach ocean waters along the U.S. West Coast
next month, scientists are reporting.
Current
models predict that the radiation will be at extremely low levels
that won't harm humans or the environment, said Ken Buesseler, a
chemical oceanographer at the Woods Hole Oceanographic Institution
who presented research on the issue last week.
But
Buesseler and other scientists are calling for more monitoring. No
federal agency currently samples Pacific Coast seawater for
radiation, he said.
"I'm
not trying to be alarmist," Buesseler said. "We can make
predictions, we can do models. But unless you have results, how will
we know it's safe?"
The
news comes three years after the devastating Japan tsunami and
resulting nuclear accident.
On
March 11, 2011, a 9.0 magnitude earthquake hit off the coast of
Japan, triggering a tsunami with waves as high as 133 feet. More than
15,000 people died and about 6,000 were injured.
The
earthquake and tsunami knocked out power to cooling pumps at the
Fukushima Daiichi nuclear power plant complex, causing meltdowns at
three reactors.
Last
July, Tokyo Electric Power Co., which operates the plant,
acknowledged for the first time that the reactor was leaking
contaminated underground water into the ocean.
Since
then, the news has gotten worse, and there is widespread suspicion
that the problem is underreported.
There
are three competing models of the Fukushima radiation plume,
differing in amount and timing. But all predict that the plume will
reach the West Coast this summer, and the most commonly cited one
estimates an April arrival, Buesseler said.
A
report presented last week at a conference of the American
Geophysical Union's Ocean Sciences Section showed that some Cesium
134 has already has arrived in Canada, in the Gulf of Alaska area.
Cesium
134 serves as a fingerprint for Fukushima, Buesseler said.
"The
models show it will reach north of Seattle first, then move down the
coast," Buesseler said.
By
the time it gets here, the material will be so diluted as to be
almost negligible, the models predict. Radiation also decays. Cesium
134, for example, has a half-life of two years, meaning it will have
half its original intensity after that period.
Crewmembers
from Ballard Diving and Salvage rake sand looking for pieces of the
dock from Japan that washed up on Agate Beach, near Newport, in
August 2012.(Photo: Timothy
J. Gonzalez, (Salem, Ore.) Statesman Journal)
In Oregon, state park rangers take quarterly samples of surf water and sand at three locations along the coast. The water is analyzed for Cesium 137 and iodine 131. Both of those already exist in the ocean at low levels from nuclear testing decades ago.
The
monitoring began in April 2012, when tsunami debris began arriving
along the Oregon coast. So far, all of the tests have shown less than
"minimum detectable activity," or the least amount that can
be measured.
Results
of the most recent samples, taken in mid-February, won't be available
until mid-March, Oregon Health Authority spokesman Jonathan Modie
said.
Washington
does not test ocean water for radiation.
"We
have none happening now and we have none planned," said Tim
Church, communications director for the Washington State Department
of Health. "Typically that would be something that would happen
on the federal level."
California
regularly samples seawater around the state's nuclear power plants to
determine whether the plants are impacting the environment. Those
results all are below minimum detectable activity.
Some
citizens and scientists are taking sampling into their own hands.
Cal
State Long Beach marine biologist Steven Manley has launched "Kelp
Watch 2014," which will partner with other organizations to
monitor kelp all along the West Coast for Fukushima radiation.
And
Buesseler recently offered the services of his lab at Woods Hole in
Massachusetts.
His
project — titled "How Radioactive Is Our Ocean?" — will
use crowd-sourced money and volunteers to collect water samples along
the Pacific Coast, then ship them across the country to be analyzed.
So
far, results are in for two locations in Washington and three in
California. They show that the plume has not yet reached the coast.
Meanwhile,
West Coast states are winding down their tsunami debris response
efforts.
Oregon's
coastline is seeing less debris from the tsunami this winter than in
the past two years, Oregon State Parks spokesman Chris Havel said.
If
that doesn't change, officials likely will disband a task force that
was mobilized to deal with the debris.
Last
year, Washington suspended its marine debris reporting hotline.
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