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Clean-up efforts at Japan's Fukushima nuclear plant, destroyed by a massive earthquake and tsunami in 2011, have significantly reduced radiation levels but untreated forested areas remain a problem, scientists said Thursday.
The disaster, second only to the massive Chernobyl meltdown in 1986, spewed radioactive material over a huge area, with the Japanese authorities targeting 9,000 square kilometres (3,500 square miles) of the most contaminated land for remedial work.
Scraping - Centimetres - Inches - Soil - Radiation
This involved scraping off the top five centimetres (two inches) of soil which was found to reduce the most common radiation source of Caesium 137 by about 80 percent, according to a review of studies on the clean-up operation published in the journal Soil.
Lead author Olivier Evrard, researcher in the climate sciences and environment laboratory at the University of San Quentin-en-Yvelines near Paris, said this technique was proving to be effective in dealing with Caesium 137 in the most accessible areas.
Caesium - Risk - Population - Environment
Caesium 137 "is the biggest risk for the population over the medium- and long-term as it can persist in the environment for up...
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