On March 22nd, 2011, as a part of monitoring activity of the surrounding 
environments, 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 analyses results of 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.
                                                    (Previously announced)

On May 19th, 2011, we conducted nuclide analyses of radioactive materials 
contained in the air which was collected at the site of Fukushima Daiichi 
Nuclear Power Station on the same day. As a result, some radioactive 
materials were detected as described in the appendix. Accordingly, today we 
have summarized the results and reported them to NISA and the government of 
Fukushima Prefecture.

We analyzed the amount of plutonium-238, plutonium-239 and plutonium-240 in 
the air contained in the samples collected on April 25 and May 2, 2011.  No 
nuclide was detected.

We will continuously conduct the same sampling surveys. 

Appendix1: Result of Nuclide Analysis of Radioactive Materials in the 
           Air at the Site of Fukushima Nuclear Power Stations 
                                                              (PDF 11.1KB) 
Appendix2: Measurements of plutonium in the air 
                   in Fukushima Daiichi Nuclear Power Station(PDF 7.56KB) 
Appendix3: Fukushima Daiichi Nuclear Power Station: 
                       The Result of the Dust Nuclide Analysis(PDF 13.6KB) 
Appendix4: Fukushima Daini Nuclear Power Station: 
                       The Result of the Dust Nuclide Analysis(PDF 14.5KB)