- This data was created based on the measurement results of radioactivity concentration in rainfall that have been sampled at and measured by the Environmental Radioactivity Monitoring Center of Fukushima Fukushima Branch (in Fukushima Hokida jinai) until September, 2015 and subsequently by the Fukushima Prefectural Centre for Environmental Creation (in Fukushima Hokida jinai) from October, 2015 and that have been released to the public in the Fukushima Prefecture Government website.
- The measurements have been conducted since April 2014.