On March 21st 2011, radioactive materials were detected from the seawater
around the discharge canal (south) of Fukushima Daiichi Nuclear Power
Station which was damaged by the 2011 off the Pacific coast of Tohoku
earthquake as a result of the sampling survey of radioactive materials in
the seawater which was implemented as a part of monitoring of surrounding
environment. We had informed the result to Nuclear and Industrial Safety
Agency (NISA) and Fukushima prefecture.
(We already informed.)
We conducted a sampling survey to investigate radioactive materials
expansion into the seawater around Fukushima Daiichi Nuclear Power
Station from March 31st to April 3rd, 2011. We informed the detection
of radioactive materials as the appendix to NISA and Fukushima Prefecture
immediately.
We also informed the seawater sampling survey result which is implemented
at three points within 15km area of the Fukushima Daiichi Nuclear Power
Plant from April 2nd.
Three nuclides (Iodine-131, Cesium-134 and Cesium-137) are fixed figures.
Other nuclides figures are to be reinvestigated by improved measures under
NISA instruction on April 1st.
We are intending to conduct the same sampling investigation. 
attachment1: The result of the nuclide analysis of the seawater (Mar 31)
(PDF 15.8KB)
attachment2: The result of the nuclide analysis of the seawater (Apr 1)
(PDF 15.7KB)
attachment3: The result of the nuclide analysis of the seawater (Apr 2)
(PDF 18.4KB)
attachment4: The result of the nuclide analysis of the seawater (Apr 3)
(PDF 43.8KB)
attachment5: Radioactivity Density Seawwater (Mar 31) (PDF 14.9KB)
attachment6: Radioactivity Density Seawwater (Apr 1) (PDF 14.9KB)
attachment7: Radioactivity Density Seawwater (Apr 2) (PDF 14.9KB)
attachment8: Radioactivity Density Seawwater (Apr 3) (PDF 48.9KB)
