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DECONTAMINATION, WASTE DISPOSAL

Despite decontamination, radiation levels too high for many Fukushima residents to return

帰還困難区域:除染後 帰還目安の空間線量超え地点が多く

 ◇住宅地など生活圏の空間線量は平均6割下がる

毎日新聞 2014年06月10日

Radiation levels in many areas of Fukushima Prefecture designated as zones where it is difficult for residents to return in the foreseeable future remain too high for residents to come back even after decontamination, the Environment Ministry said.

 

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Areas near the crippled Fukushima No. 1 Nuclear Power Plant where the annual radiation levels are over 50 millisieverts and are unlikely to fall below 20 millisieverts within five years after the March 2011 nuclear accident have been designated as zones where it is difficult for residents to return.

The ministry decontaminated six designated areas in the Fukushima Prefecture towns of Namie and Futaba between October last year and January this year as model projects. In the decontamination work, the surface of soil was stripped away, soil was cleaned with high-pressure water and weeds were removed.

As a result, the average airborne radiation levels in residential areas, on farmland and roads, which had stood at 7.65 to 19.12 microsieverts per hour, fell about 60 percent to 3.35 to 7.09 microsieverts following decontamination.

Still, residents would be exposed to more than 20 millisieverts per year in many of these areas if they are to live in wooden houses and stay outdoors for eight hours a day.

Radiation levels in forests in these areas declined only about 20 percent even after decontamination.

環境省は10日、東京電力福島第1原発事故で汚染された福島県の帰還困難区域で 実施したモデル除染の結果を発表した。除染の効果で、住宅地など生活圏の空間線量は平均約6割下がった一方、除染後も多くの地点で住民帰還の目安となる年 間20ミリシーベルトを超える見込み。政府は今後、この結果を参考に同区域の長期的な線量見通しを示し、自治体や住民の意向を踏まえた上で、本格除染に入 るかどうかを判断する。

帰還困難区域は放射線量が年間50ミリシーベルトを超え、事故後5年が過ぎても年20ミリシーベルトを下回らない恐れのある区域。同原発周辺の7市町村にまたがる。

モデル除染は昨年10月〜今年1月、同県浪江、双葉両町の計6地区で、表土のはぎ取りや高圧水洗浄、除 草など標準的な方法で実施した。その結果、除染前に1時間あたり平均7.65〜19.12マイクロシーベルトだった生活圏(宅地、農地、道路)の空間線量 は除染後、同3.35〜7.09マイクロシーベルトと約6割下がった。木造住宅に住み1日8時間屋外で過ごすと仮定すると、多くの地区が除染後も年間20 ミリシーベルトを上回ることになる。一方、森林の線量低減率は約2割にとどまった。

環境省は「さらに線量を低減しようとすれば土地の従来の機能を損ねかねない。区域の将来像を検討する中で追加除染の必要性を判断したい」と話している。【阿部周一】

 

Live from Lalaland

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Discussion

2 thoughts on “Despite decontamination, radiation levels too high for many Fukushima residents to return

  1. What needs to be pointed out to the average person is that most of the time when they say radiation, they actually mean radioactive contamination. Radiation is emitted energy and is only an indicator to radioactive elments in the enviorment. While radiation isnt good, the real danger lays in becoming radioactively contaminated, not the radiation. That the radiation is that high means that for sure there is radioactive elements present and is therefore a danger to human, there is no threshold for radioactive contamination. They also know that it attacks organs and not body mass as is another misconception. The ailments of radioactive contamination are so long that you would never know if its that or something else. The end case is cancer, but alot else is attributed to it.
    How not to become contaminated if you live in area that is radioactive? There is no way not to become contaminated. Its that insidious. It gets in the food, water and so forth. Radioactive elements can be ingested, inhaled and even asorbed by the skin. There is no way to get away from it if its in your enviorment.
    Now once you get that radioactive element in your body. Then the radiation that that element emits within the body is the radiation that kills you. Causing your cells to mutate and not to be able to reproduce, which is what we call cancer. Which is the result of the cells getting hit with the energy emitted by the radioactive element. Then think of the build up of that element in the body, and up the energy emitted and the more it goes up the quicker you sucumb to it. Radioactive Decomtamination for humans is in the infancy phase atm, still testing, and its not going to good.

    Posted by Andrew Jackson | June 15, 2014, 5:03 pm

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