Abstract
The γ-rays of the atmospheric particles collected in Shizuoka-city from March 15 to March 27, 2011 were measured. Radioactive nuclides due to the Fukushima Daiichi Nuclear Power Plant accident were found in the samples. Day to day variation of concentration of 131I and 137Cs etc. indicated two times arrival of radioactive plume from Fukushima to Shizuoka-city and suggested that the surface of Shizuoka-city had been slightly contaminated with radioactive cesium on mainly March 15.
