Ministry of Health, Labour and Welfare

Ministry of Health, Labour and Welfare

Exposure Dose Distribution of the Workers at
Fukushima Daiichi Nuclear Power Plant

Updated on 30 June 2020


1. Radiation Exposure Dose Distributions

(1)The distribution of external exposure dose of the workers during the last 3 months
   (Numbers of workers who entered each area every month)

Effective dose (E) mSvMar 2020Apr 2020May 2020
TEPCOContractorsTotalTEPCOContractorsTotalTEPCOContractorsTotal
100<E0 0 0 0 0 0 0 0 0
75<E≤1000 0 0 0 0 0 0 0 0
50<E≤750 0 0 0 0 0 0 0 0
20<E≤500 0 0 0 0 0 0 0 0
10<E≤200 4 4 0 1 1 0 0 0
5<E≤100 46 46 0 28 28 0 24 24
1<E≤517 765 782 18 591 609 9 556 565
E≤1900 5,252 6,152 807 4,737 5,544 773 4,763 5,536
Total917 6,067 6,984 825 5,357 6,182 782 5,343 6,125
Maximum(mSv)1.86 14.30 14.30 3.37 10.40 10.40 1.81 8.51 8.51
Average(mSv)0.12 0.47 0.42 0.11 0.39 0.35 0.09 0.36 0.33

(*)Exposure doses and the number of workers are subject to change due to the replacement of accumulated doses measured using PAD with monthly doses measured using an integrating dosimeter and the reflection of values for workers wearing only an integrating dosimeter (e.g., workers working only within a seismically isolated building).

(2)Combined Cumulative Effective Dose from April 2016 (Internal and External)

Effective dose (E) mSvApril 2016 - April 2020April 2016 - May 2020Difference
TEPCOContractorsTotalTEPCOContractorsTotalTEPCOContractorsTotal
100<E0 0 0 0 0 0 0 0 0
75<E≤1000 18 18 0 20 20 0 2 2
50<E≤750 235 235 0 245 245 0 10 10
20<E≤5068 1,772 1,840 69 1,811 1,880 1 39 40
10<E≤20144 2,317 2,461 144 2,309 2,453 0 -8 -8
5<E≤10186 2,375 2,561 186 2,375 2,561 0 0 0
1<E≤5592 4,564 5,156 595 4,597 5,192 3 33 36
E≤11,295 9,525 10,820 1,294 9,601 10,895 -1 76 75
Total2,285 20,806 23,091 2,288 20,958 23,246 3 152 155
Maximum(mSv)46.82 80.02 80.02 46.94 81.42 81.42 ---
Average(mSv)2.99 6.42 6.08 3.02 6.47 6.13 ---
(*) Exposure doses and the number of workers are subject to change due to the replacement of accumulated doses measured using PAD with monthly doses measured using an integrating dosimeter and the reflection of values for workers wearing only an integrating dosimeter (e.g. workers working only within a seismically isolated building).

(3) Combined Cumulative Effective Dose from April 2019 (Internal and External)

Effective dose (E) mSvApril 2020April 2020 - May 2020Difference
TEPCOContractorsTotalTEPCOContractorsTotalTEPCOContractorsTotal
100<E0 0 0 0 0 0 0 0 0
75<E≤1000 0 0 0 0 0 0 0 0
50<E≤750 0 0 0 0 0 0 0 0
20<E≤500 0 0 0 0 0 0 0 0
10<E≤200 1 1 0 5 5 0 4 4
5<E≤100 28 28 0 129 129 0 101 101
1<E≤518 591 609 37 925 962 19 334 353
E≤1807 4,737 5,544 857 4,815 5,672 5078128
Total825 5,357 6,182 894 5,874 6,768 69 517 586
Maximum(mSv)3.3710.40 10.40 3.7413.20 13.20 ---
Average(mSv)0.110.390.350.180.680.62---
(*)Exposure doses and the number of workers are subject to change due to the replacement of accumulated doses measured using PAD with monthly doses measured using an integrating dosimeter and the reflection of values for workers wearing only an integrating dosimeter (e.g. workers working only within a seismically isolated building).

(4) Distribution of sum of external exposure dose and internal exposure dose of workers engaged in specified high-dose work*
(Specified high-dose work has not been performed since October 2015.)

Effective dose (E) mSvMarch 2011- September 2015
100<E1
75<E≤100191
50<E≤75233
20<E≤50267
10<E≤20186
5<E≤10129
1<E≤5145
E≤151
Total1,203
Maximum(mSv)102.69
Average(mSv)36.49
(*)Workers engaged in work to which dose limit (100 mSv) during emergency work is applied in line with Article 7 of the Ordinance on Prevention of Ionizing Radiation Hazards.
Specifically, these workers are those who are engaged in work to maintain the functions of a nuclear reactor facility or spent fuel storage pool, or in work to maintain functions to suppress or prevent the possible release of a large amount of radioactive materials due to a failure of or damage to the nuclear reactor facility at a location around the nuclear reactor facility, steam turbine, or accessory facility where hourly dose may exceed 0.1 mSv.
It should be noted that only TEPCO employees have so far been engaged in specified high-dose work.
(*)Workers engaged in specified high-dose work in each month is the number of workers registered as workers engaged in specified high-dose work in that month.
However, the total of March 2011 to September 2015 includes workers released from specified high-dose work.
(*)Exposure doses and the number of workers are subject to change due to the replacement of accumulated doses measured using PAD with monthly doses measured using an integrating dosimeter and the reflection of values for workers wearing only an integrating dosimeter (e.g., workers working only within a seismically isolated building).
(*)The results of re-evaluating committed doses in March 2011 reveal that maximum cumulative effective doses for the period between March 2011 and September 2015 exceeded 100.

Archives

Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 June 2020).
PDF 128KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 May 2020).
PDF 116KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 24 April 2020).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 25 March 2020).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 28 February 2020).
PDF 50KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 January 2020).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 25 December 2019).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 November 2019).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 October 2019).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 September 2019).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 August 2019).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 July 2019).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 June 2019).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 May 2019).
PDF 82KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 24 April 2019).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 March 2019).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 February 2019).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 January 2019).
PDF 83KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 December 2018).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 November 2018).
PDF 83KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 October 2018).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 28 September 2018).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 August 2018).
PDF 83KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 July 2018).
PDF 89KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 June 2018).
PDF 89KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 May 2018).
PDF 83KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 April 2018).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 March 2018).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 28 February 2018).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 January 2018).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 December 2017).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 November 2017).
PDF 90KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 October 2017).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 September 2017).
PDF 83KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 August 2017).
PDF 83KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 July 2017).
PDF 123KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 June 2017).
PDF 80KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 May 2017).
PDF 81KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 28 April 2017).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 March 2017).
PDF 73KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 28 February 2017).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 January 2017).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 December 2016).
PDF 70KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 November 2016).
PDF 73KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 October 2016).
PDF 73KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 September 2016).
PDF 73KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 August 2016).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 July 2016).
PDF 73KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 June 2016).
PDF 57KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 May 2016).
PDF 48KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 April 2016).
PDF 88KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 March 2016).
PDF 81KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 February 2016).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 January 2016).
PDF 82KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 25 December 2015).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 November 2015).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 October 2015).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 September 2015).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 August 2015).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 July 2015).
PDF 92KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 June 2015).
PDF 83KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 May 2015).
PDF 71KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 1 May 2015).
PDF 76KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 March 2015).
PDF 86KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 February 2015).
PDF 53KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 January 2015).
PDF 53KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 26 December 2014).
PDF 63KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 1 December 2014).
PDF 63KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 October 2014).
PDF 63KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on September 2014).
PDF 64KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on August 2014).
PDF 64KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on July 2014).
PDF 64KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 June 2014).
PDF 63KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 May 2014).
PDF 58KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 April 2014).
PDF 64KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 March 2014).
PDF 54KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 28 February 2014).
PDF 32KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 January 2014).
PDF 86KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 26 December 2013).
PDF 86KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 November 2013).
PDF 86KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 October 2013).
PDF 86KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Station
(Updated on 30 September 2013)
PDF 85KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Station
(Updated on 30 August 2013)
PDF 79KB


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