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Το ραδιενεργό ιώδιο έχει κυκλοφορήσει “νόμιμα” από τους ευρωπαϊκούς πυρηνικούς σταθμούς ηλεκτροπαραγωγής εδώ και πάνω από 50 χρόνια! Χρησιμοποιείται για την “παρακολούθηση των ωκεανών”

Radioactive iodine has been “legally” released by European nuclear power
plants for over fifty years… used for “tracking ocean currents”
by: Isabelle Z.

Bermuda is a popular getaway destination, attracting people who are
looking to get away from urban life and recharge a bit surrounded by crystal
clear waters and nature. The beaches of Bermuda might not have that stifling
big-city air, but something quite unexpected is lurking far beneath its waters.
A study that was recently presented at the Goldschmidt geochemistry conference
in France has revealed that radioactive material from European nuclear power
plants had made its way to the tropical waters of Bermuda.
Incredibly, nuclear reprocessing plants at La Hague in France and
Sellafield in the U.K. have been legally releasing radioactive contaminants for
more than 50 years. In fact, scientists have started using the radioactive
material known as 129iodine (129I) to track the movements of currents in the
ocean. While they are quick to point out that the levels of radioactivity in
the North Atlantic are very low and not dangerous, many people are
uncomfortable with the idea of such chemicals being intentionally released into
our planet’s waters.
The Bedford Institute of Oceanography’s Dr. John N. Smith said the
tracking enabled them to confirm just how deep the ocean currents in the North
Atlantic flow. The iodine began its 15,000-kilometer journey at the two plants
in France and the U.K. and continued flowing north to the Arctic Ocean off of
Norway. From there, it circulated around arctic basins before returning to
Nordic Seas in a pattern known as the Arctic loop. Next, it headed south down
North America’s continental slope before reaching Bermuda at depths below 3,000
meters. It has already made its way across a third of the globe, and it is
expected to continue to flow to the south into the South Atlantic and
ultimately spread itself throughout the ocean.
The scientists chose 129I because it is easily detectable even at very
low levels with the help of accelerator mass spectrometry. It decays at a
predictable rate and has an amazingly long half-life of 15.7 million years. The
same isotope was produced in nuclear testing and the disasters at Fukushima and
Chernobyl.
Risky game of “stick in a stream”
The researchers want to determine the movement of the deep ocean
currents that pull carbon dioxide from the atmosphere into the ocean. Oceans
are believed to have absorbed around a quarter of all the carbon dioxide that
is emitted by humans.
The scientists liken it to the old “stick in a stream” game that many
kids play, where they drop something buoyant into a body of water and watch
where it comes out. This version, of course, is a lot more scientific – and far
more potentially dangerous.
Half life of nearly 16 million years
129I was one of the most concerning radioactive isotopes released into
the environment as a result of the meltdown at Fukushima. Radiation in oceans
eventually enters the water supply, which means it will make its way to the
food supply at some point. In addition, iodine from the ocean can enter the air
in the form of sea spray or iodine gas, according to the Agency for Toxic Substances
and Disease Registry. It also remains in soil for a long time, where it can be
taken up by the plants growing there. Why are we adding even more of this to
our waters? It may not be dangerous in small amounts, but what happens as more
and more starts to accumulate

Monday, August 28, 2017.

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