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 October 4 and 5, 2011, we conducted a nuclide analysis of radioactive
materials contained in the air which was collected at the site of
Fukushima Daiichi and Daini Nuclear Power Stations. As shown in the
attachment, radioactive materials were not detected.
The second, third and forth samplings at 2 to 3 km offshore of Fukushima
Daiichi NPS, which was planned to implement on the day before yesterday,
were cancelled due to the weather condition.
As the result of the strontium analysis from the air sampled on September
12 and the plutonium analysis from the air sampled on September 19, they
were not detected as in the attachment.
We reported the above results to NISA as well as to the government of
Fukushima Prefecture today.
We will continuously conduct the same sampling surveys. 
Appendix1: Nuclide Analysis Results of Radioactive Materials in the Air at
the Sites of Fukushima Nuclear Power Stations (PDF 17.6KB)
Appendix2: Fukushima Daiichi Nuclear Power Station Analysis Result of
Plutonium in the Air (PDF 7.91KB)
Appendix3: Fukushima Daiichi Nuclear Power Station Analysis Result of
Strontium in the Air (PDF 7.66KB)
Appendix4: Fukushima Daiichi Nuclear Power Station Results of Dust Nuclide
Analysis (PDF 17.9KB)
Appendix5: Fukushima Daini Nuclear Power Station Results of Dust Nuclide
Analysis (PDF 10.4KB)
