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Decontamination in the prefecture

2017年10月18日更新 Update

In Fukushima Prefecture, some areas are decontaminated by national governmental agencies and other areas are by municipal agencies.

What is decontamination?

Decontamination is to reduce the amount of radiation received in the living areas by removing radioactive materials or by burying them underground.

Reduction of environmental radiation dose involves decontamination achieved by a combination of three methods, "removal", "blocking", and "keeping it away at a distance."

  • "Removal" of soil and vegetation contaminated with radioactivity
  • The removed soil and vegetation contaminated with radioactivity are then covered with uncontaminated soil "to block" the radiation.
  • These removed contaminated materials are taken away from where people are living.
Link to Off-site Decontamination Measures

Reference: "Decontamination and Radiation Q&A" on the Decontamination Information Plaza homepage (Fukushima Prefecture, and Ministry for the Environment)

Decontamination methods and the effects

Image : Progress on Off-site Cleanup and Interim Storage in Japan

Quotation : "Progress on Off-site Cleanup and Interim Storage in Japan" p.33-35 December 2015 Ministry of the Environment, Japan

Decontamination method

*Decontamination Activities in Tamura City

Image :Decontamination Activities in Tamura City 1
Wiping off rooftop and walls
Image :Decontamination Activities in Tamura City 2
Wiping off a gutter
Image :Decontamination Activities in Tamura City 3
High pressure water cleaning of a drain pipe
Image :Decontamination Activities in Tamura City 4
High pressure water cleaning of paved road
Image :Decontamination Activities in Tamura City 5
Mowing and removal of sludge
Image :Decontamination Activities in Tamura City 6
Removal of crushed stones and topsoil, and covering with clean soil

*Before & After the Decontamination Work in Tamura City

Image : Before & After the Decontamination Work in Tamura City

Effects of decontamination

*Effect on Decontamination Work in Tamura City

Image : Effect on Decontamination Work in Tamura City1

  • Decontamination work has reduced air dose rates by approx. 36% for residential houses.
  • The data from the post-decontamination monitoring confirm that the effects of whole-area decontamination have remained and show that air dose rates have been continuously decreasing.

Image : Effect on Decontamination Work in Tamura City2

Progress in decontamination

除染
Decontaminated zones and summary
LegendZone nameAgencySummary
color:Light blueSpecial decontamination areaNational GovernmentThe "former planned evacuation zones" where the annual integral dose may exceed 20 milisievert (mSv) and the "former warning zones" located within 20 km of the Fukushima Daiichi Nuclear Power Station.
color:Red framePriority contamination survey areaMunicipalityMunicipality including areas where the annual additional exposure dose exceeds 1 mSv
color:BrownMunicipalities where the decontamination plan is in effectMunicipalityMunicipality where a decontamination plan was drawn up and is in progress

Progress in decontamination conducted by national governmental agencies(Special decontamination area)

Image : Progress in decontamination conducted by national governmental agencies

Progress in decontamination conducted by national governmental agencies P.9-11 (Ministry of the Environment: Decontamination data website)

Progress in decontamination conducted by municipal agencies(Priority contamination survey area)

Progress in decontamination in all the municipal areas to be decontaminated (36 municipalities)

*Actual progress in decontamination compared to planned number by the end of May 2017

Decontamination