[2D19-23] Environmental Radioacitivty and Radiation Measurement 2

[2D20] Characteristics in atmospheric concentration distribution and nuclide composition in the southward traveling plume in the early morning of March 15, 2011

*Hiromi Yamazawa¹, Naoki Yaguchi¹, Jun Moriizumi¹, Yu Kuwahara² (1. Nagoya University, 2. Ibaraki Pref. Environmental Radiation Monitoring Center)

Keywords:atmospheric concentration, nuclide composition, spatial distribution, Fukushima nuclear accident

Atmospheric concentration of Xe-133, I-131, 132, 133 and Te-132 in the southward traveling plume in the early morning of March 15, 2011 was analyzed from the NaI(Tl) pulse height distribution data obtained at 21 monitoring stations in the central part of Ibaraki. Spatial distribution and temporal change in I-131 concentration and nuclide composition were discussed.