Width and Center-axis Location of the Radioactive Plume That Passed Over Dolon and Nearby Villages on the Occasion of the First USSR A-bomb Test in 1949

概要

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In relation to the efforts to reconstruct the radiation dose in Dolon village, which was affected by the first USSR atomic bomb test in 1949 at the Semipalatinsk nuclear test site, the width and the center-axis location of the radioactive plume were investigated based on the soil contamination data around Dolon and the nearby villages. Assuming that the radioactive plume passed over along a straight line from the ground zero point to this area, the spatial distributions of soil contamination were plotted as a function of the perpendicular distance from the supposed center-axis of the plume. In total 83 and 52 soil contamination data were available for ^<137>Cs and ^<239,240>Pu, respectively. The plotted distribution formed a peak-like shape both for ^<137>Cs and ^<239,240>Pu. A Gaussian function drawn so as to envelop the points plotted for ^<239,240>Pu indicated that the central part of the radioactive plume passed over the residential area of Dolon with a σ value of 1.5km. Additional soil contamination data around Dolon and other villages are necessary for more detailed discussion.
日本放射線影響学会の論文
2005-12-28