Radiation levels at Fukushima 1st nuclear power plant have dropped significantly

Reuters reported that the International Atomic Energy Agency (IAEA) announced on Tuesday that Japanese data shows that radiation levels at the Fukushima No. 1 nuclear power plant have dropped significantly.

IAEA pointed out that at GMT on Tuesday (Beijing time on Tuesday), the radiation measured at the Fukushima No. 1 Nuclear Power Plant gate was 11.9 mSv/hour, six hours later.
The number dropped to 0.6 million siphet/hour. IAEA uses the unit of MSW/hour to measure the radiation intensity of human beings. Generally, 4000 MSW will produce fatal harm to humans.