Abstract
Abstract. The radioisotope pollution shows two types of patterns: dry and wet deposits for nuclear power plant accidents. Two surface pollution patterns were analysed by fractal. In Fukushima nuclear power plant accident, surface pollution by wet deposits was estimated to occur. However, actually it was no rain and white crystals were observed on the surface. Then, fractal analysis was carried out for the spatial distribution patterns of radio isotopes on the surface to judge the types of deposits. As a reference, Chernobyl nuclear power plant accident was checked for the spatial distribution patterns of radioisotopes on the surface. The objective patterns by fractal analysis were the surface pollution maps in Fukushima and Chernobyl, Abukuma river watershed map, and NOAA/AVHRR. The calculation of fractal dimensions was carried out with the box counting for binarized images. Fractal analysis results suggested the next conclusions. The radioisotope pollution in Fukushima might occur in both dry and wet deposits. The dry deposit might make the pollution pattern similar to the watershed, while the wet deposit might make the pollution pattern similar to cloud images. Moreover, most radioisotope contaminants might flow on the road in the forest valley and deposit on forest with and without rainfall in Fukushima.
Highlights
Each process was calculated from meteorological data for radioisotope pollutions (Japan Meteorological Agency, 2014) with hydrogen explosions at Fukushima Daiichi nuclear power plant derived from the earthquake and Tsunami on March 11, 2011
(1) The radioisotope pollution for Iidate village from Fukushima Daiichi power plant was emitted by the leak mainly on March 15, 18 and 20
(2) The radioisotope pollution from Fukushima Daiichi nuclear power plant was limited because the diffusion of radioisotopes was controlled by mountain in altitude 500m to 1192m
Summary
Each process was calculated from meteorological data for radioisotope pollutions (Japan Meteorological Agency, 2014) with hydrogen explosions at Fukushima Daiichi nuclear power plant derived from the earthquake and Tsunami on March 11, 2011. The pollution at Iidate village was estimated mainly from wet deposits by hydrogen explosion at the second reactor on March 15 (Imanaka, 2014). It was little rainfall at the period and dry deposits might be the main pollution by the leak including air vent. The radioisotope pollution was examined on March 12 to 31. Fractal analysis was applied to the contribution rate of dry and wet deposits in Fukushima. Fractal dimension is the value corresponding to complexity for the forms
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