This data was created based on radiation monitoring of soil in Fukushima Prefecture, available in the Monitoring Information of Environmental Radioactivity Level, the portal site run by Secretariat of the Nuclear Regulation Authority. The purpose was to ascertain the change of deposion density of radioactive plutonium in the prefecture before and after the accident. The measurements were conducted for the soil samples obtained from March to October 2011. The data here was converted to Bq/kg-dry-soil.
Publicly available data collected from the website of the relevant organizations and converted into CSV, XML, and KML formats that were easy to use.