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2026年7月23日更新
Basic Survey (Estimation of external radiation exposure dose) (Japanese Only)
- External exposure doses were estimated from activity records over four months following the nuclear accident for 2,055,238 residents in the prefecture as of 11 Mar. 2011.
- Out of the 467,730 people (as of the end of Mar. 2025) who responded to the survey excluding those with experience in radiation work and those whose estimated exposure period was less than four months, 99.8% were exposed to less than 5 mSv (millisieverts), with the maximum value being 25 mSv.
*Total number of respondents: 569,899 (response rate: 27.7%) - The dose estimates obtained in this survey (external effective dose for the first 4 months after the accident: 99.8% less than 5mSv, etc.) have been evaluated as being below the level of statistically significant differences in verifiable health effects in the light of current scientific knowledge.
- See here for more on the survey results
Document 1 from the 56th "Prefectural Oversight Committee for the Fukushima Health Management Survey" ( 25 Jul. 2025) (Japanese only)
Thyroid Ultrasound Examination (Ultrasound examination to assess the condition of thyroid) (Japanese Only)
- Ultrasound examinations were conducted to Fukushima residents who were around 18 years old or younger at the time of the disaster.
- The Thyroid Ultrasound Examination Evaluation Subcommittee summarised its view on the results from the Preliminary Baseline Survey to the Full-Scale Survey (5th round), concluding that “no association between thyroid cancer and radiation exposure was found”.
- Meanwhile, it was also suggested that, in order to ensure the voluntary nature of examination, future examinations should be conducted in a manner that allows residents to make informed decisions based on sufficient information. This includes clearly communicating the benefits and disadvantages of the examination, as well as the conclusions and insights gained from this summary.
- See here for more on the evaluation
Summary of the Subcommittee on the results from the Preliminary Baseline Survey to the Full-Scale Survey (5th round) "The Thyroid Ultrasound Examination Evaluation Subcommittee" of the Prefectural Oversight Committee for the Fukushima Health Management Survey (Jul. 2025) (Japanese only)
1 Preliminary baseline screening (As of 31 Mar. 2018) [Conducted in FY2011-2013]
| Number of eligible individuals | 367,637 people | |
|---|---|---|
| Number of examinees | 300,472 people (examination rate: 81.7%) | |
| Number of results acquired | 300,472 people (aquisition rate: 100.0%) | |
| A (A１) classification | 154,605 people (51.5%) | |
| A (A２) classification | 143,573 people (47.8%) | |
| B classification | 2,293 people (0.8%) | |
| C classification | 1 person (0.0%) | |
| Number of eligible individuals | 2,293 people |
|---|---|
| Number of examinees | 2,130 people (examination rate: 92.9%） |
| Number of confirmed diagnosis | 2,091 people (diagnose rate: 98.2%) Of which, cases with malignancy or suspected malignancy: 116 people |
2 Full scale examination (Second round) (As of 31 Mar. 2021) [Conducted in FY2014-2015]
| Number of eligible individuals | 381,237 people | |
|---|---|---|
| Number of examinees | 270,552 people (examination rate: 71.0%） | |
| Number of results acquired | 270,552 people (aquisition rate: 100.0%） | |
| A (A１) classification | 108,726 people (40.2%) | |
| A (A２) classification | 159,596 people (59.0%) | |
| B classification | 2,230 people (0.8%) | |
| C classification | 0 people (0.0%) | |
| Number of eligible individuals | 2,230 people |
|---|---|
| Number of examinees | 1,877 people (examination rate: 84.2%) |
| Number of confirmed diagnosis | 1,834 people (diagnose rate: 97.7%) Of which, cases with malignancy or suspected malignancy: 71 people |
3 Full Scale Examination (Third round) (As of 31 Mar. 2021) [Conducted in FY2016-2017]
| Number of eligible individuals | 336,667 people (excluding individuals born between FY1992-1993, the subjects of the milestone examination at the age of 25) |
|---|---|
| Number of examinees | 217,922 people (examination rate: 64.7%) |
| Number of results acquired | 217,922 people (aquisition rate: 100.0%) |
| Number of eligible individuals | 1,502 people |
|---|---|
| Number of examinees | 1,104 people (examination rate: 73.5%) |
| Number of confirmed diagnosis | 1,068 people (diagnose rate: 96.7%) Of which, cases with malignancy or suspected malignancy: 31 people |
4 Full Scale Examination (Fourth round) (As of 30 Jun. 2022) [Conducted in FY2018-2019]
| Number of eligible individuals | 294,228 people (excluding individuals born between FY1992-1995, the subjects of the milestone examination at the age of 25) | |
|---|---|---|
| Number of examinees | 183,410 people (examination rate: 62.3%) | |
| Number of results acquired | 183,410 people (aquisition rate: 100.0%) | |
| A (A１) classification | 61,712 people (33.6%) | |
| A (A２) classification | 120,304 people (65.6%) | |
| B classification | 1,394 people (0.8%) | |
| C classification | 0 people (0.0%) | |
| Number of eligible individuals | 1,394 people |
|---|---|
| Number of examinees | 1,036 people (examination rate: 74.3%) |
| Number of confirmed diagnosis | 1,016 people (diagnose rate: 98.1%) Of which, cases with malignancy or suspected malignancy: 39 people |
5 Full Scale Examination (Fifth round) (As of 31 Dec.2024) [Conducted in FY2020-2022]
| Number of eligible individuals | 252,936 people (excluding individuals born between FY1992-1997, subjects of the milestone examination) | |
|---|---|---|
| Number of examinees |
113,959 people (examination rate: 45.1%) |
|
| Number of results acquired | 113,959 people (aquisition rate: 100.0%) | |
| A (A１) classification | 32,846 people (28.8%) | |
| A (A２) classification | 79,767 people (70.0%) | |
| B classification | 1,346 people (1.2%) | |
| C classification | 0 people (0.0%) | |
| Number of eligible individuals | 1,346 people |
|---|---|
| Number of examinees | 1,116 people (examination rate: 82.9%) |
| Number of confirmed diagnosis | 1,101 people (diagnose rate: 98.7%) Of which, cases with malignancy or suspected malignancy: 50 people |
6 Full Scale Examination (Sixth round) (As of 30 Sep. 2025) [Conducted in FY2023-2024]
| Number of eligible individuals | 211,928 people (excluding individuals born between FY1992-1999, subjects of the milestone examination) | |
|---|---|---|
| Number of examinees |
69,011 people (examination rate: 32.6%) |
|
| Number of results acquired | 69,011 people (aquisition rate: 100.0%) | |
| A (A１) classification | 18,507 people (26.8%) | |
| A (A２) classification | 49,516 people (71.8%) | |
| B classification | 988 people (1.4%) | |
| C classification | 0 people（0.0%） | |
| Number of eligible individuals | 988 people |
|---|---|
| Number of examinees | 783 people (examination rate: 79.3%) |
| Number of confirmed diagnosis | 744 people (diagnose rate: 95.0%) Of which, cases with malignancy or suspected malignancy: 21 people |
7 Full Scale Examination (Seventh round examination) (As of 30 Sep. 2025) [Conducted in FY2025-2026]
| Number of eligible individuals | 171,951 people (excluding individuals born between FY1992-2001, subjects of the milestone examination) | |
|---|---|---|
| Number of examinees |
10,979 people (examination rate: 6.4%) |
|
| Number of results acquired | 4,918 people (aquisition rate: 44.8%) | |
| A (A１) classification | 1,302 people (26.5%) | |
| A (A２) classification | 3,522 people (71.6%) | |
| B classification | 94 people (1.9%) | |
| C classification | 0 people（0.0%） | |
8 Milestone Examination at the age of 25 (As of 30 Sep. 2025) [Conducted in FY2017 onwards]
| Number of eligible individuals | 169,956 people (Born between FY1992-1999) | |
|---|---|---|
| Number of examinees | 13,887 people (examination rate: 8.2%) | |
| Number of results acquired | 13,880 people (aquisition rate: 99.9%) | |
| A (A１) classification | 5,867 people (42.3%) | |
| A (A２) classification | 7,234 people (52.1%) | |
| B classification | 779 people (5.6%) | |
| C classification | 0 people (0.0%) | |
| Number of eligible individuals | 779 people |
|---|---|
| Number of examinees | 652 people (examination rate: 83.7%) |
| Number of confirmed diagnosis | 641 people (diagnose rate: 98.3%) Of which, cases with malignancy or suspected malignancy: 27 people |
9 Milestone examination at age 30 (As of 30 Sep. 2025) [Conducted in FY2022 onwards]
| Number of eligible individuals | 66,542 people (Born between FY1992-1994) | |
|---|---|---|
| Number of examinees | 4,343 people (examination rate: 6.5%) | |
| Number of results acquired | 4,339 people (aquisition rate: 99.9%) | |
| A (A１) classification | 1,900 people (43.8%) | |
| A (A２) classification | 2,056 people (47.4%) | |
| B classification | 383 people (8.8%) | |
| C classification | 0 people (0.0%) | |
| Number of eligible individuals | 383 people |
|---|---|
| Number of examinees | 313 people (examination rate: 81.7%) |
| Number of confirmed diagnosis | 293 people (diagnose rate: 93.6%) Of which, cases with malignancy or suspected malignancy: 10 people |
*Those who receive a B or C in the primary examination are invited to undergo a confirmatory examination.
Comprehensive Health Checkup (General health checkup items and differential count of leukocytes) (Japanese Only)
| Number of eligible individuals | Number of examinees | Examination rate | |
|---|---|---|---|
| For those aged 15 and below | 15,952 people | 1,103 people | 6.9％ |
| For those aged 16 and above | 192,623 people | 32,748 people | 17.0％ |
| Overall | 208,575 people | 33,851 people | 16.2% |
Mental Health and Lifestyle Survey (Questionnaire survey conducted for residents in evacuation zones and other relevant regions) (Japanese Only)
| Number of eligible individuals | Number of valid responses | Response rate |
|---|---|---|
| 190,748 people | Children 1,659 people | 17.2% |
| General 31,257 people |
For more detailed results of the survey, please see the link below.
About Fukushima Health Management Survey "Mental Health and Lifestyle Survey" (Japanese only)
Pregnancy and Birth Survey (Questionnaire survey for mothers with maternal and child health handbook) (Japanese Only)
- The survey was conducted to understand the mental and physical health of pregnant and postpartum women, reduce anxiety, and provide necessary care.
- The survey consists of a "Main Survey" conducted about one year after a pregnancy notification has been submitted and "Follow-up Surveys" conducted four and eight years after childbirth.
- The Main Survey ended in FY2022 because the rates of premature birth, low birth weight, and congenital anomalies were found to be almost no different from government statistics and generally reported data.
- For more detailed results of the survey, please see the link below.
About Fukushima Health Management Survey "Pregnancy and Birth Survey" (Japanese only)
Internal radiation exposure examination using whole-body counter (Measurement of internal radiation dose to the entire human body) (Japanese Only)
The examination measures the radioactive cesium absorbed into the body from the atmosphere, food and other sources using a whole-body counter, and estimates the radiation dose expected to be received over a lifetime.
- For the latest survey status of internal exposure testing using whole-body counters, please refer to the link below.
Results of internal exposure testing using whole-body counters (Japanese Only)
Fukushima Health Management Survey Investigative Committee
For Fukushima Health Management Survey, an investigative committee consisting of experts has been established for professional insight.
For the latest survey status of the Fukushima Health Management Survey, please refer to the materials of Investigative Commitee at the links below.
Fukushima Health Management Survey Investigative Committee (Japanese Only)
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