On March 28th 2011, as part of monitoring activity of the surrounding
environment, we conducted analysis of plutonium contained in the soil
collected on March 21st and 22nd at the 5 spots in Fukushima Daiichi
Nuclear Power Station. As a result, plutonium 238, 239 and 240 were
detected as shown in the attachment.
We will continue the radionuclide analysis contained in the soil.
‹Results of the analysis›
-Plutonium was detected in the soil of Fukushima Daiichi Nuclear Power
-The density of detected plutonium is equivalent to the fallout observed
in Japan when the atmospheric nuclear test was conducted in the past.
-The detected plutonium from two samples out of five may be the direct
result of the recent incident, considering their activity ratio of the
-The density of detected plutonium is equivalent to the density in the
soil under normal environmental conditions and therefore poses no major
impact on human health. TEPCO strengthens environment monitoring inside
the station and surrounding areas.
-We will conduct analysis of the three additional soil samples.
attachment1:Result of Pu measurement in the soil in Fukushima Daiichi
Nuclear Power Plant(PDF 80.9KB)
attachment2:Fukushima Daiichi Nuclear Power Station Sampling Spots of Soil
attachment3:Fukushima Daiichi Nuclear Power Station Regular Sampling Spots
of Soil(PDF 135KB)