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2025年6月30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 2,055,238residents in the prefecture as of 11 Mar. 2011.
- Out of the 467,484people (as of the end of March 2024) 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: 569,691 (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 52nd "Prefectural Oversight Committee for the Fukushima Health Management Survey" ( 2 August 2024) (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 (4th round), concluding that "no association between thyroid cancer and radiation exposure was found". - Meanwhile, the necessity of monitoring the generation of infants at the time of the nuclear accident, who had relatively high thyroid equivalent doses and are highly sensitive to radiation, was suggested for future examinations due to the possibility of delayed effects from low-dose radiation exposure.
- See here for more on the evaluation
Summary of the Subcommittee on the results from the Preliminary Baseline Survey to the Full-Scale Survey (4th round) "The Thyroid Ultrasound Examination Evaluation Subcommittee" of the Prefectural Oversight Committee for the Fukushima Health Management Survey (July 2023) (Japanese only)
１ Preliminary baseline screening (As of March 31, 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 examination) (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 examination) (As of 31 Mar. 2021) [Conducted in FY2016-2017]
| Number of eligible individuals | 336,667 people (Excluding individuals born in 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 examination) (As of 30 Jun. 2022) [Conducted in FY2018-2019]
| Number of eligible individuals | 294,228 people (Excluding individuals born in 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 examination) (As of 31 Dec.2024) [Conducted in FY2020-2022]
| Number of eligible individuals | 252,936 people (Excluding individuals born in 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 examination) (As of 30 Sep.2024) [Conducted in FY2023-2024]
| Number of eligible individuals | 211,901 people (Excluding individuals born in FY1992-1999, subjects of the milestone examination) | |
|---|---|---|
| Number of examinees |
53,022 people (Examination rate: 25%) |
|
| Number of results acquired | 47,951 people (Aquisition rate: 90.4%) | |
| A (A1) classification | 12,925 people (27.0%) | |
| A (A2) classification | 34,320 people (71.6%) | |
| B classification | 706 people (1.5%) | |
| C classification | 0 people（0.0%） | |
| Number of eligible individuals | 706 people |
|---|---|
| Number of examinees | 461 people (Examination rate: 65.3%) |
| Number of confirmed diagnosis | 412 people (Diagnose rate: 89.4%) Of which, cases with malignancy or suspected malignancy: 12 people |
7 Milestone Examination at the age of 25 (As of 30 Sep.2024) [Conducted in FY2017 onwards]
| Number of eligible individuals | 149,843 people (Born in FY1992-1998) | |
|---|---|---|
| Number of examinees | 12,867 people (Examination rate: 8.6%) | |
| Number of results acquired | 12,855 people (Aquisition rate: 99.9%) | |
| A (A1) classification | 5,441 people (42.3%) | |
| A (A2) classification | 6,704 people (52.0%) | |
| B classification | 710 people (5.5%) | |
| C classification | 0 people (0.0%) | |
| Number of eligible individuals | 710 people |
|---|---|
| Number of examinees | 592 people (Examination rate: 83.4%) |
| Number of confirmed diagnosis | 575 people (Diagnose rate: 97.1%) Of which, cases with malignancy or suspected malignancy: 25 people |
8 Milestone examination at age 30 (As of 30 Sep.2024) [Conducted in FY2022 onwards]
| Number of eligible individuals | 44,489 people (Born in FY1992-1993) | |
|---|---|---|
| Number of examinees | 2,996 people (Examination rate: 6.7%) | |
| Number of results acquired | 2,971 people (Aquisition rate: 99.2%) | |
| A (A1) classification | 1,271 people (42.8%) | |
| A (A2) classification | 1,432 people (48.2%) | |
| B classification | 268 people (9.0%) | |
| C classification | 0 people (0.0%) | |
| Number of eligible individuals | 268 people |
|---|---|
| Number of examinees | 192 people (Examination rate: 71.6%) |
| Number of confirmed diagnosis | 162 people (Diagnose rate: 84.4%) Of which, cases with malignancy or suspected malignancy: 7 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 | 17,053 people | 1,312 people | 7.7％ |
| For those aged 16 and above | 192,855 people | 33,598 people | 17.4％ |
| Overall | 209,890 people | 34,910 people | 16.6% |
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 |
|---|---|---|
| 193,785 people | 37,061 people | 19.1% |
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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