Above: Dr. Buesseler on the beach at Bikini.

We recently got some unique uploads from Bikini and Enewetak Atolls, courtesy of Dr. Ken Buesseler, of the Woods Hole Oceanographic Institution (WHOI).
Dr. Buesseler is a leading oceanographer studying the spread and effects of radioactive releases to the ocean from Fukushima, who started a very important and successful crowdsourced program to collect and analyze ocean water samples from the Pacific coast of North America, called “Our Radioactive Ocean.”
Map links:
Bikini–lagoon, onshore at Namu
Enewetak – by ship and ashore
Enewetak — Runit dome
We’ve stayed in touch with Dr. Buesseler over the past few years, and when we heard that he was heading to Bikini, SAFECAST advisor Dan Sythe (CEO of Int’l Medcom) rushed a bGeigie Nano to Honolulu from Sebastopol, CA, for him to use. It just happens to be one Dan’s wife Orapin built, which has pink-tinted acrylic parts is and decorated with a Hello Kitty sticker.
The Hello Kitty Nano mounted onboard the ship.

Dr. Buesseler writes:
“This is a privately funded research cruise on the R/V Alucia. Quite a nice ship compared to our govt. funded ones! It’s a one off chance to sample an important site of over 100 nuclear weapons tests and about 80% of the total yield from US testing (so many big tests were conducted here). Given our limits to space and funding, we are not sampling any living animals, plants, marine life, corals, fish, algae etc. so it is more focused on radionuclide concentrations and sources, not on uptake in food chain. While levels for many will be higher, data from the 1970’s shows that cesium in the ocean today post Fukushima near the NPP is actually higher than in the lagoons. Plutonium may be a different story as it was (still is?) higher here, and is quite low from Fukushima.”
Buesseler’s team left Majuro on Jan 16, were at Bikini atoll sampling from Jan 18-20 (including the crater left by the Castle Bravo nuclear bomb test on March 1, 1954), then heading to Enewetak for 3 days (with one sampling station in between for waters in the upper 2000m) before a 3 day steam back to Majuro.
Enewak Atoll is about 300km west of Bikini
Buesseler’s team surveyed the Runit Dome (aka “Cactus Dome”) at Enewetak, which covers the 30-foot (9 meter) deep, 350-foot (107 meter) wide crater created by the May 5, 1958, Cactus test.
Dr. Buesseler at the Runit Dome. His readings from on top of the dome itself were basically normal background – about 20-30CPM – but his team will be sampling groundwater from wells near the dome, to see if it is elevated.
From the project notes:
“The Marshall Islands have been a source of man‐made radioactivity to the Pacific Ocean originating with the nuclear weapons testing program of the 1950s‐1960s. Today Fukushima has contributed an amount similar to what is left today in the North Pacific from these tests, highlighting the need for automated sampling technologies to assess future unanticipated events.
Link: Fukushima and Ocean Radioactivity
“Our project will use the Marshall Islands as a natural laboratory for testing a suite of automated techniques including the JetYak sample collection platform and a field radon monitor for measuring radionuclide inputs that come from groundwater seepage into the ocean.
“We will be collecting samples inside and outside the Bikini and Enewetak Atoll Lagoons using these automated methods as well as hand‐collected samples from the R/V Alucia
(www.aluciatheship.com) . We will also be going ashore to many of the islands to collect nearshore samples that cannot be reached by the ship and groundwater samples from existing monitoring wells or temporary wells installed by our team.”

Welcome to Enewetak!
The Nano at a well water sampling site on Enewetak.
Above: Dr. Buesseler on the beach at Bikini.

ビュッセラー博士は、福島から海への放射性物質の拡散と影響を研究している世界トップクラスの海洋学者で、北アメリカ沿岸の海水のサンプルを集めて分析する、“Our Radioactive Ocean” と呼ばれる重要なクラウドソースのプログラムを実行しました。
ビキニ環礁 onshore at Namu
エニウェトク by ship and ashore
エニウェトク ルニットドーム
私たちは過去数年間、ビュッセラー博士と連絡を取り合っており、彼がビキニ環礁に向かうと聞いた際に、セーフキャストのアドバイザーであるインターナショナル・メドコム社のダン・サイス氏が、bGeigie Nano(ビーガイギー・ナノ)をカリフォルニアのセバストポルからホノルルまで急いで持っていってくれました。

これはR/V Aluciaのヨット上で行う個人の資金で実現した調査クルーズです。私たちの政府の船と比べてすごく良い船ですよ!
スペースに資金という制約条件により、私たちはいかなる動植物、海洋生物、サンゴ、魚、藻ら、何も採取しません。なので、食物連鎖の取込ではなく、放射性核種濃度と原因に注力します。多くの生物の放射線濃度は高いでしょうが、1970年代のサンゴ礁よりも福島第一近辺の海洋の方がセシウムの濃度は高いでしょう? プルトニウムの高さについては、ここでは福島とは別の話になります。福島ではプルトニウムはかなり低いです。

ルニットドームにいるビュッセラー博士。ドームの頂上にいる彼の計測値は、基本的に通常値(20 – 30CPM)となっている。しかし、彼のチームはドームの近くにある井戸の地下水をサンプリングして値が上がっているかを調査しにいく。
リンク: Fukushima and Ocean Radioactivity
私たちのプロジェクトは マーシャル諸島を、地下水の海洋への浸透からきた放射性核種の流入を計測するためのJetYakサンプル収集プラットフォームと現地のラドンモニターといったような一連の自動化技術を検証するという目的での自然の実験室として利用する予定です。
私たちは、これらの自動化手段やR/V Aluciaに乗って手動で集めたサンプルを用いて、ビキニ環礁やエニウェトク環礁の内外のサンプルを集めていきます。
(www.aluciatheship.com) 私たちはさらに 既存のモニタリング用井戸や私たちが設置した一時的な井戸から 船や地下水サンプルからは得られない岸辺近くのサンプルを集めるためにたくさんの島々にも上陸する予定でいます。

翻訳:Shin-ichiro Yamamoto