2012 Volume 63 Issue 3-4 Pages 107-118
In order to obtain the geochemical knowledge of material cycle as a tracer and to contribute the safety of inhabitant, the aerosol observation data at the GSJ from the end of March to December2011 were discussed after the establishment of observation and quantification methods for artificial radionuclides.The detector efficiency was obtained by the standard ore radiation source and the sum effect of Cs-134 was corrected by using of Cs-134/Cs-137 activity ratio. Most of the artificial radionuclides except Cs-134 and Cs-137 in aerosol became below the detection limit at the end of June. The observed concentrations are estimated to be harmless to health. The meteorological effect on Cs-137 concentration such as rainfall and wind direction was not so clearly shown, partly because the time resolution of observation was low and the long time elapsed after the accident.
