Basic Survey: Purpose

The Basic Survey was conducted for the purpose of estimating the level of radiation exposure of people who were residing in Fukushima Prefecture at the time of the accident at Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi NPS, and compiling data useful for individuals' health management into the future.

Specifically, inquiry sheets were delivered to the applicable residents to ask them to record their behavior during the four months after the accident. Based on the behavioral records entered in the inquiry sheets, individuals' external doses were estimated using a program developed by the National Institute of Radiological Sciences.

Individuals' estimated external doses were compiled and statistically processed, and have been utilized for analyzing radiation exposure and its health effects in Fukushima Prefecture.

• Included in this reference material on March 31, 2013
• Updated on December 1, 2017