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 July 16, 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, no radioactive
materials were detected as described in the 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 10.8KB) 
Appendix2: Fukushima Daiichi Nuclear Power Station Results of Dust Nuclide 
           Analysis (PDF 14.0KB) 
Appendix3: Fukushima Daini Nuclear Power Station Results of Dust Nuclide 
           Analysis (PDF 13.7KB)