On March 22, 2011, as a part of monitoring activity of the surrounding
environments, we conducted nuclide analyses of radioactive materials
contained in the air which was 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 June 23, 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 also conducted analyses of plutonium in the air collected on June 6,
2011. As a result, plutonium was not been detected as seen Appendix.

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 52.8KB) 
Appendix2:Result of Plutonium measurement in the air at Fukushima Daiichi 
          Nuclear Power Station(PDF 29.2KB) 
Appendix3:Fukushima Daiichi Nuclear Power Station:The Result of the 
          Dust Nuclide Analysis(PDF 36.9KB) 
Appendix4:Fukushima Daini Nuclear Power Station:The Result of the 
          Dust Nuclide Analysis(PDF 37.3KB)