Ministry of Health, Labour and Welfare

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

Updated on 31 May 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 February 2016 March 2016 April 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 12 12 0 19 19 0 0 0
5<E≤10 0 78 78 0 93 93 0 43 43
1<E≤5 49 1,461 1,510 44 1,291 1,335 15 839 854
E≤1 1,128 7,896 9,024 1,125 8,051 9,176 972 7,725 8,697
Total 1,177 9,447 10,624 1,169 9,454 10,623 987 8,607 9,594
Maximum(mSv) 4.70 12.36 12.36 2.71 13.82 13.82 1.81 9.46 9.46
Average(mSv) 0.22 0.59 0.55 0.20 0.59 0.55 0.14 0.38 0.36

(*)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
TEPCO Contractors Total
100<E 0 0 0
75<E≤100 0 0 0
50<E≤75 0 0 0
20<E≤50 0 0 0
10<E≤20 0 0 0
5<E≤10 0 43 43
1<E≤5 15 839 854
E≤1 972 7,725 8,697
Total 987 8,607 9,594
Maximum(mSv) 1.81 9.46 9.46
Average(mSv) 0.14 0.38 0.36
(*) 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) Combined Cumulative Effective Dose of Workers to Whom Emergency Dose Limits Apply*

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 under the application of the emergency dose limit (100mSv) shown in Article 7 of the Ordinance on Prevention of Ionizing Radiation Hazards.
Specifically, they are workers engaged in work to maintain the function of cooling reactors or spent fuel tanks or to maintain the function to control or prevent the release of a huge amount of radioactive material due to trouble or a breakdown at a reactor facility, in an area where radiation dose rates exceed 0.1 mSv/h, around any reactor facilities, steam turbines and related facilities, and the vicinity thereof in the NPP. Until now, all designated workers have been TEPCO employees.
(*) The monthly number of workers to whom emergency dose limits apply is the number of workers who have filed applications as such. However, the cumulative number for the period between March 2011 and September 2015 includes those whose designation was removed.
(*) 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 31 May 2016).
PDF 58KB
Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 April 2016).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 March 2016).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 February 2016).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 January 2016).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 25 December 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 November 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 October 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 September 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 August 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 July 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 June 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 29 May 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 1 May 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 March 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 27 February 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 30 January 2015).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 26 December 2014).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 1 December 2014).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on 31 October 2014).
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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).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Plant
(Updated on July 2014).
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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).
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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).
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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).
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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).
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Station
(Updated on 30 September 2013)
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Exposure Dose Distribution of the Workers at Fukushima Daiichi Nuclear Power Station
(Updated on 30 August 2013)
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