[ RadSafe ] evacuation: where and how long?

[Karen Street]

The Washington Post (http://www.washingtonpost.com/world/off-limits/2011/11/19/gIQAdmobcN_graphic.html and http://www.washingtonpost.com/world/asia_pacific/after-japan-nuclear-disaster-a-wasteland/2011/11/16/gIQAt7ZTcN_story.html) is predicting that the 20 km zone mandatory evacuation zone could be off limits for decades, yet UNSCEAR talks about an order of magnitude reduction of Cs in 4 - 6 years after Chernobyl (http://www.unscear.org/docs/reports/2008/11-80076_Report_2008_Annex_D.pdf).

Why is so much of the area around Chernobyl still evacuated? What will determine evacuation in the area around Fukushima. Are the really radioactive areas villages, farms, forest, or a combination, and will that alter decision-making?
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Best wishes, 
Karen Street
Friends Energy Project
blog http://pathsoflight.us/musing/index.php