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
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.
On April 21st, 2011, we conducted nuclide analyses 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, on April 22nd, 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 the air collected
on April 11th and no above nuclides have been detected from the analyzed
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
Appendix: The result of measured Pu in the air at Fukushima Daiichi Nuclear
Power Station(PDF 12.2KB)
Appendix: Fukushima Daiichi: the result of the dust nuclide analysis
Appendix: Fukushima Daini: the result of the dust nuclide analysis