Thyroid Ultrasound Examination: Order of Full-scale Survey

The Preliminary Baseline Survey of the Thyroid Ultrasound Examination was conducted sequentially, starting in areas where ambient dose rates were higher at the time of the accident at Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi NPS.

For Full-scale Surveys following the Preliminary Baseline Survey, notices of the examination have been sent mostly in the same order. In the Full-scale Survey (sixth-round survey), the primary examination was conducted for those aged 18 or younger by region over two years.

Since the Full-scale Survey (fourth-round survey), for those aged 19 or older, the examination has been conducted not by region but by age (school year).

Since FY2017, the examination has been conducted for those who become 25 years old in the relevant year, and then once every five years thereafter.

Due to the impact of the COVID-19 pandemic, the Full-scale Survey (fifth-round survey) was decided to be carried out in three years, but notices of the examination were sent to examination targets living outside Fukushima Prefecture in FY2020 and FY2021, as originally planned, while allowing them to receive the examination until the end of FY2022.

• Included in this reference material on March 31, 2015
• Updated on March 31, 2025