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Published on Tuesday, November 15, 2011 by BBC News
http://www.bbc.co.uk/news/science-environment-15691571
by Jennifer Carpenter
New research has found that radioactive material in parts of north-eastern Japan exceeds levels considered safe for farming.
The findings provide the first comprehensive estimates of contamination across Japan following the nuclear accident in 2011.
Food production is likely to be affected, the researchers suggest.
The results are reported in the Proceedings of National Academy of Sciences (PNAS) journal.