On March 22nd, 2011, as part of monitoring activity of the surrounding
environment, we conducted nuclide analyses of radioactive materials
contained in the air which were collected at the site of Fukushima Daiichi
Nuclear Power Station, which was damaged by the
Tohoku-Chihou-Taiheiyou-Oki Earthquake. As a result, radioactive materials
were detected and therefore, we summarized the results and reported them
to Nuclear and Industry Safety Agency ("NISA") as well as to the
government of Fukushima Prefecture.
The three nuclides (Iodine-131, Cesium-134 and Cesium-137) are to be
released as fixed figures, and the other nuclide figures are to be
revaluated in accordance with the preventive measures formulated after the
warning from NISA on April 1st.
(Previously announced)
On April 17th, 2011, we conducted a nuclide analysis of radioactive
materials contained in the air which were collected at the site of
Fukushima Daiichi Nuclear Power Station on the same day. As a result,
radioactive materials were detected as described in the exhibit.
Accordingly, we have reported the result of the analysis to NISA and the
government of Fukushima Prefecture.
Concerning the nuclides of Plutonium -238, Plutonium -239 and
Plutonium -240 in air, sampling and analyses were conducted on April 4th
and no above nuclides have been detected from the analyzed samples.
We are planning to conduct these surveys continuously. 
Appendix: The result of the nuclide analysis of radioactive materials in
the air at the site of Fukushima Nuclear Power Station
(PDF 12.4KB)
Appendix: The result of measured Pu in air at Fukushima Daiichi Nuclear
Power Station (PDF 7.75KB)
Appendix: Fukushima Daiichi: the result of the dust nuclide analysis
(PDF 13.3KB)
Appendix: Fukushima Daini: the result of the dust nuclide analysis
(PDF 13.5KB)
