Ministry of Health, Labour and Welfare

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

Updated on 30 November 2017


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) mSv August 2017 September 2017 October 2017
TEPCO Contractors Total TEPCO Contractors Total TEPCO Contractors Total
100<E 0 0 0 0 0 0 0 0 0
75<E≤100 0 0 0 0 0 0 0 0 0
50<E≤75 0 0 0 0 0 0 0 0 0
20<E≤50 0 0 0 0 0 0 0 0 0
10<E≤20 0 0 0 0 0 0 0 0 0
5<E≤10 0 19 19 0 16 16 0 29 29
1<E≤5 19 651 670 15 657 672 28 678 706
E≤1 979 7,164 8,143 1,033 7,082 8,115 952 6,841 7,793
Total 998 7,834 8,832 1,048 7,755 8,803 980 7,548 8,528
Maximum(mSv) 3.20 7.60 7.60 3.30 7.50 7.50 2.48 9.71 9.71
Average(mSv) 0.13 0.32 0.30 0.11 0.32 0.30 0.14 0.33 0.31

(*)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) mSv April 2016 - September 2017 April 2016 - October 2017 Difference
TEPCO Contractors Total TEPCO Contractors Total TEPCO Contractors Total
100<E 0 0 0 0 0 0 0 0 0
75<E≤100 0 0 0 0 0 0 0 0 0
50<E≤75 0 7 7 0 7 7 0 0 0
20<E≤50 0 612 612 1 661 662 1 49 50
10<E≤20 54 1,403 1,457 64 1,439 1,503 10 36 46
5<E≤10 127 1,695 1,822 124 1,757 1,881 -3 62 59
1<E≤5 463 4,525 4,988 470 4,534 5,004 7 9 16
E≤1 1,208 7,565 8,773 1,220 7,669 8,889 12 104 116
Total 1,852 15,807 17,659 1,879 16,067 17,946 27 260 287
Maximum(mSv) 19.21 55.56 55.56 20.33 57.32 57.32 - - -
Average(mSv) 1.61 3.97 3.72 1.66 4.06 3.81 - - -
(*) 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 2017 (Internal and External)

Effective dose (E) mSv April 2017 - September 2017 April 2017 - October 2017 Difference
TEPCO Contractors Total TEPCO Contractors Total TEPCO Contractors Total
100<E 0 0 0 0 0 0 0 0 0
75<E≤100 0 0 0 0 0 0 0 0 0
50<E≤75 0 0 0 0 0 0 0 0 0
20<E≤50 0 30 30 0 40 40 0 10 10
10<E≤20 0 412 412 1 495 496 1 83 84
5<E≤10 18 726 744 29 816 845 11 90 101
1<E≤5 227 2,519 2,746 251 2,793 3,044 24 274 298
E≤1 1,169 7,110 8,279 1,179 7,009 8,188 10 -101 -91
Total 1,414 10,797 12,211 1,460 11,153 12,613 46 356 402
Maximum(mSv) 9.10 29.57 29.57 11.21 29.57 29.57 - - -
Average(mSv) 0.60 1.76 1.63 0.68 1.93 1.78 - - -
(*) 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) mSv March 2011- September 2015
100<E 1
75<E≤100 191
50<E≤75 233
20<E≤50 267
10<E≤20 186
5<E≤10 129
1<E≤5 145
E≤1 51
Total 1,203
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 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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