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\title{Science AMA Series: I'm Ken Buesseler, an oceanographer who has been
studying the impacts of Fukushima Dai-ichi on the oceans. It's been 5
years now and I'm still being asked -- how radioactive is our ocean? and
should I be concerned? AMA.}



\author[1]{Ken_Buesseler }%
\author[1]{r/Science AMAs}%
\affil[1]{Affiliation not available}%


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  \date{April 24, 2026}


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\begin{abstract}
I'm Ken Buesseler, an oceanographer who studies marine radioactivity.
I've looked at radioactive fallout from atmospheric nuclear weapons
testing that peaked in the early 1960's, studied the Black Sea after
Chernobyl in 1986, the year of my PhD, and now we are looking at the
unprecedented sources of radionuclides from Fukushima Dai-ichi in 2011.
I also studying radioactive elements such as thorium that are naturally
occurring in the ocean as a technique to study the ocean's carbon cycle
http://cafethorium.whoi.edu Five years ago, images of the devastation in
Japan after the March, 11 ``Tohoku'' earthquake and tsunami were a
reminder of nature's power. Days later, the explosions at the Fukushima
Dai-ichi nuclear power plants, while triggered by nature, were found to
be man-made, due to the building of these critical plants on this coast,
despite warnings of possible tsunami's much higher than the 35 foot sea
wall built to protect it. More than 80\% of the radioactivity ended up
in the oceans where I work- more ocean contamination than from
Chernobyl. Since June of 2011, we've spent many research voyages
sampling with Japanese, US and international colleagues trying to piece
together the consequences to the ocean. We also launched in in January
2014 ``Our Radioactive Ocean''-a campaign using crowd funding and
citizen scientist volunteers to sample the N. American west coast and
offshore for signs of Fukushima radionuclides that we identify by
measuring cesium isotopes. Check out http://OurRadioactiveOcean.org for
the participants, results and to learn more. So what do we know after 5
years? This is the reason we are holding this AMA, to explain our
results and let you ask the questions. I'll be back at 1 pm EST (10 am
PST, 6 pm UTC) to answer your questions, ask me anything! Thanks to
everyone for some great questions today! I'm signing off but will check
back tonight. We released some new data today from
OurRadioactiveOcean.org Go to that web site to learn more and propose
new sites for sampling. We need to continue to monitor our radioactive
oceans. Thanks to our moderator today and the many collaborators and
supporters we've had over these past 5 years, too numerous to list here.
More at http://www.whoi.edu/news-release/fukushima-site-still-leaking%
\end{abstract}%



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