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- (1)
The amount of radioactive materials released from TEPCO's Fukushima Daiichi Nuclear Power Station has significantly decreased compared to the immediate aftermath of the accident.
- (2)
Air dose rate and fallout have generally been reduced. Other than the neighbouring areas of Fukushima Prefecture, radiation levels have returned to normal ranges.
- (3)
Radioactive cesium deposited on the ground surface has adhered to the soil, remaining in the upper layers of the soil without easily penetrating into the ground.
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- (4)
As radioactive materials released into the atmosphere immediately after the accident has already been reduced by rainfall about 10 days after the accident, subsequent rainfall had only a minimal impact.
- (5)
During heavy rainfall, there is a possibility that the upper soil layers, where radioactive cesium is adsorbed, could be washed into rivers along with rainwater and potentially enter water supply sources as turbid components.
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- (6)
Even if radioactive cesium enters water supply sources, it can be effectively removed along with turbid components through stringent turbidity control measures and water treatment processes such as coagulation sedimentation and sand filtration in water treatment facilities.
- (7)
Radioactive cesium settled on the ground surface has adhered to soil, remaining in the upper layers of the soil without easily penetrating into the ground.
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