Incoming radiative aerosols at Osaka from the disaster of Fukushima Daichi nuclear power plant

摘要

We observed the radiative aerosols(radiative cesium 134 Cs, 137 Cs and radiative iodine 131 I) at Osaka about 600km from the Fukushima Daichi nuclear power plant after the accident caused by magnitude-9 earthquake and subsequent tsunami hit northeastern Japan on 11th March 2011. Observed radio activities 137Cs and 131I are fission products of the uranium fuel. 134Cs is the secondary product in the nuclear power plant. We collected the aerosols with high volume air sampler from 17 March 2011 to November(Table1) . The gammaray energy spectrum on the collected aerosols were measured by Ge-solid state detectors in the iron shield for low level back ground radiation(Table2).