A new study has documented a positive correlation between the radiation levels near the disaster site and growth mutations in Japanese fir trees. The study looked for mutated branching in the trees using the horizontal rows of branches that indicate a growth year.
There was a significant increase in these kinds of mutations after 2011 and in higher numbers where radiation levels were the highest.
98% of trees in a 3.5-kilometer area from Fukushima Daiichi have defects. The radiation dose in the area is about 34 microsieverts per hour.
44% of trees in a 8.5-kilometer area from Fukushima Daiichi have defects. The radiation dose in the area is about 20 microsieverts per hour.
27% of trees in a 15-kilometer zone from Fukushima Daiichi have defects. The radiation dose in the area is about 7 microsieverts per hour.
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