We have put together a valuable set of sediment samples from riverbeds, estuaries and seabed nearshore in the Tohoku region of Japan, mostly in the vicinity of the Fuksuhima Daiichi Nuclear power plant. Half of the samples have been taken before the Typhoon VongFong, the other half during the Typhoon VongFong (Oct 13th 2014 over Tohoku region). The goal is to understand the motion of sediments from land to sea using radioactive tracers, in other words “make a map of seabed radioactivity around the Fukushima Power Plant“. Here a rough analog simulation – and here an excellent scientific paper explaining how radioactivity “travels” seasonally that we try to extend – connecting land / river to sea data. We do not have the results / measurements of Cesium of our samples yet, hopefully before the end of 2014.
Video by Philippe Couture
- Map : https://www.google.com/maps/d/edit?mid=z9TEP44t6lQc.kD7qS3OZGNs8
- Google table : https://docs.google.com/spreadsheets/d/1KdykyHPgILh7AnIdNo-yZiB5IgaMiijMSIclbp5DFtU/edit?usp=sharing
- CSV locations – to load on any mapping software : https://drive.google.com/file/d/0Bwv8Kbgg0Q8vaUNOVG55QXJBTE0/view?usp=sharing
- KML file – to open with Google Earth : https://drive.google.com/file/d/0Bwv8Kbgg0Q8vWC1iYmI5YjVjemc/view?usp=sharing
The instrument we use is a “Micro Rolling Trawler” that we developed that captures only a few millimeters of surface (recent) sediments. That allows us to have a “snapshot” of the seabed surface.
All the data we collect is publicly available for free. We will study mostly Cesium. If you are interested in these samples to analyse other isotopes, we would be very happy to share with you free of charge as long as you share publicly the data / results. Please get in touch : firstname.lastname@example.org
Many thanks to Julie Nagai, Philippe Couture, Jun Kamei, Shinya & Angela Saeki, Dr Olivier Evrard, Kenichi Kawamura, Prof Hiroshi Kainuma, Umilabo, Soness Stevens, Rohini Karen Deblaise, Dean Newcombe, Safecast Joe Moross, Prof Yoshida of Tohoku University, Christina Moorehead, Jay Klaphake, Kaori Hilton, Maria Ichizawa, Takuro Mizuta, Hiroshi Nomura, Katagiri Family, Zhiruo Gao, Yoshiko Toyama, Toby Marshall and all those who supported our efforts. You can see where we drove with Safecast bGeigieNano (Oct 7, Oct 8, Oct 13, Oct 14) or as one big map.