From Kyodo News :
" Defense Minister Toshimi Kitazawa said Thursday he has given the go-ahead for Self-Defense Forces helicopters to drop water onto a troubled reactor at the Fukushima No. 1 nuclear plant as the radiation level was 4.13 millisievert per hour at an altitude of 1,000 feet.
The level comes to 87.7 millisievert at 300 feet, the minister also said."
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