Ministry of Health, Labour and Welfare

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

Updated on 30 June 2016


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 March 2016 April 2016 May 2016
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 19 19 0 0 0 0 0 0
5<E≤10 0 93 93 0 42 42 0 16 16
1<E≤5 44 1,291 1,335 16 870 886 8 628 636
E≤1 1,125 8,051 9,176 1,097 7,853 8,950 1,002 7,613 8,615
Total 1,169 9,454 10,623 1,113 8,765 9,878 1,010 8,257 9,267
Maximum(mSv) 2.71 13.82 13.82 1.90 9.78 9.78 2.42 9.40 9.40
Average(mSv) 0.20 0.59 0.55 0.16 0.41 0.38 0.12 0.30 0.28

(*)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 April 2016- May 2016 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 0 0 0 0 0 0 0 0
10<E≤20 0 0 0 0 17 17 0 17 17
5<E≤10 0 42 42 0 122 122 0 80 80
1<E≤5 16 870 886 59 1,422 1,481 43 552 595
E≤1 1,097 7,853 8,950 1,135 7,904 9,039 38 51 89
Total 1,113 8,765 9,878 1,194 9,465 10,659 81 700 781
Maximum(mSv) 1.90 9.78 9.78 3.05 18.96 18.96 - - -
Average(mSv) 0.16 0.41 0.38 0.25 0.64 0.60 - - -
(*) 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).
(*) As a new 5-year dose period began in April 2016, the 5-year accumulated dose will be described in April 2017 or later.

(3) 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 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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