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Home > Fukushima Revitalization > Fukushima Revitalization > Health of residents of the prefecture

Health of residents of the prefecture

2017年3月14日更新 Update

Residents' health survey results

Basic surveys (Estimation of the external exposure doses)

  • Estimating the external exposure doses in the 4-months period from the occurrence of the nuclear disaster (March 11) to June 11, 2011.
  • Targeted at approx. 2.05 million residents in the prefecture as of March 11, 2011.
  • Number of those who responded to the self-administered questionnaire: 565,484, as of June 2016 (Response rate: Approx. 27.5%)
Image : Basic surveys

Result of the estimation of external exposure doses

[Entire prefecture] Proportion of the values from 0 to 2 mSv: 93.8% (Except for those engaged in radiation-related work)

Thyroid examinations (Ultrasonography to examine the thyroid gland condition)

Targeted at residents of the prefecture, who were 18 years old or younger when the earthquake disaster occurred

[ Prior examination (Primary examination) ] (FY2011 to FY2013)...Complete

Conducted in order to understand the thyroid conditions

  • Number of subjects: approx. 370,000
  • Number of those who underwent the examinations: approx. 300,000
  • Participation Rate: 81.7%
Image : Thyroid examinations 1

[ Main examination (Primary examination) ] (FY2014 onwards)

In FY2014 and FY2015, all the subjects were examined to understand their thyroid condition after the prior examination.
After that, the subjects are examined every 2 years until the of age 20. Subsequently, they are examined every 5 years, that is, at ages 25, 30, and so forth.

  • Number of subjects: approx. 380,000
  • Number of those who underwent the examinations: approx. 270,000 as of Dec 2016
Image : Thyroid examinations 2

[ Prior examination / Main examination ] Results of primary examinations (as of Dec, 2016)

Evaluation resultsEvaluation detailsPrior examinationMain examination
Number of examinees
(Unit: Person)
PortionNumber of examinees
(Unit: Person)
Evaluated as AA1No nodule or cyst154,60799.2%108,68899.2%
A2Nodule sized 5.0mm or less, or cyst sized 20.0mm or less143,575159,554
Evaluated as BNodule sized 5.1mm or more, or cyst sized 20.0mm or more2,2930.8%2,2260.8%
Evaluated as CRequiring the secondary examination immediately10.0%00.0%
  • To be followed up until the next examination if judged as A1 or A2
  • The secondary examination is carried out if judged as B or C.
  • Even if evaluated as A2, those who are determined to be in need of the secondary examination in accordance with the thyroid conditions and the like are judged as B.
  • Prior examination ... 116 cases were determined to be malignant or suspected to be malignant as a result of the secondary examination. (Including one case with a benign nodule.)
  • Main examination ... 69 cases were determined to be malignant or suspected to be malignant as a result of the secondary examination (where the results of 1,681 targets were confirmed).

[Reference] Comparison with the data of other prefectures

* The test result on thyroid abnormality rates in three prefectures

Target areasImage:Target areas
Survey subjectsThose aged 3 to 18 years
4,365 persons
Survey results[A1] 1,853 persons (42.5%)
[A2] 2,468 persons (56.5%)
[B] 44 persons (1.0%)
[C] 0 persons (0.0%)

Source:Ministry of the Environment press release materials

Internal exposure examination using the whole body counter (The internal exposure dose of the whole body is measured.)

By using the whole body counter, the radioactive cesium taken into the body from the atmosphere, food, drinks, etc. is measured to estimate the approximate dose received during one's entire lifetime.

Results of the examination conducted by the prefecture

* Committed effective dose: The approximate internal exposure dose received during one's entire life

(Unit: person)
Less than 1 mSv 319,436Image:whole body counter
1 mSv14
2 mSv10
3 mSv2

Cumulative number of persons examined in the prefecture: 319,962 (June 2011 to January 2017)

Medical examination (General examination items ,Examination of the differential count of leukocytes)

Image:Medical examination

Number of subjects: 215,315
Number of those who underwent the examinations: 48,889
Participation Rate: 22.7%(Confirmed report levels on March 31, 2016)

Mental health ,Survey on pattern of living. (Questionnaire to the residents of the evacuation zones)

Image: Mental health ,Survey on pattern of living

Number of subjects: 208,433
Number of valid respondents: 44,952
Response rate: 21.6% (March 2016)

Questionnaire to expectant and nursing mothers. (Questionnaire for those, to whom the maternity passbooks were issued)

Image: Questionnaire to expectant and nursing mothers

Number of subjects: 14,569
Number of valid respondents: 5,868
Response rate: 40.3% (March 2016)

Related links: Fukushima Medical University's homepage in English

Image : Fukushima Radiation and Health

Development of the most advanced center for radiological research and medical care

To protect the healthy lives of residents now and in the future, a cutting-edge research and medical care center has been established.

Fukushima Global Medical Science Center



  1. Radiology and Health Management Center for Residents of Fukushima
  2. Advanced Clinical Research Center (Open on Apr 18,2016)
  3. Advanced Medical Care Department (Open in December 2016)
  4. Education & Human Resources Development Department
  5. Medical & Industrial Translational Research Center (Open in September 2016) to support for the development of therapeutic drugs and diagnostic drugs, and joint research initiatives involving industry, academia and government.

Place: Fukushima City (Fukushima Medical University)
Completed in December 2016

Related links: Fukushima Global Medical Science Center Basic Concept

Image :Fukushima Global Medical Science Center Basic Concept