Overview of active cesium contamination of freshwater fish in Fukushima and Eastern Japan, Scientific Reports 2013 (h/t Anonymous tip): [...] The serious accidents of the Fukushima Nuclear Power Plant have been contaminating a vast area in eastern Japan, home of 60 million people. Consumption of freshwater fish is an important part of the aquatic pathway for the transfer of radionuclides to the freshwater ecosystem creatures including humans. [...] we have to think that the contamination of freshwater fish is widespread not only in river basins but also all over the ground included all types of water-systems, for example, agricultural and urban water systems. [...] In this paper we show the relation between distance and contamination levels by inverse regression analysis. The results indicate the effects of quasi radioactive cesium 137 by the Fukushima accident look like less serious than those of the Chernobyl accident. However, contamination levels are possibly higher than the Chernobyl as the cesium is concentrated by the water systems in limitation region. Water paddy field look like shallow pond saved mud included cesium 137. Moreover, the cesium137 will distribute and concentrate by high density irrigation canal and urban water-system. For example, the highly contaminated Taisho river bottom soil Cs134: 4,335 Bq/kg, Cs137: 5,456 Bq/kg was found at 1/11/2011 at Kitakashiwa bridge of Kashiwa city in Tokyo metropolitan area, 200 km south-west from the plant. Therefore we must carefully and continuously monitor the contamination to the freshwater ecosystem and human health.
Professor Hiroaki Koide, Kyoto University Reactor Research Institute, Welcome to Fukushima (2013): The Japanese government reported to the IAEA about the situation at the Fukushima plant following the accident on March 11. They estimated the dispersion of radioactive material in the air. I feel that the report seriously underestimated the amount of cesium 137 in the atmosphere. According to my estimate, it is about 400-500 times greater than that of Hiroshima.
Published: October 22nd, 2013 at 4:46 pm ET