The level of radiation detected at the Fukushima Daiichi plant has fallen steadily over the past 12 hours, an official at Japan's Nuclear and Industrial Safety Agency has said, according to the Reuters news agency. A level of 752 microsieverts per hour was recorded at the plant's main gate at 1700 on Wednesday (0800 GMT), said Tetsuo Ohmura. The monitoring point was then changed to the plant's west gate and readings were taken every 30 minutes, he said. At 0500 on Thursday (2000 GMT on Wednesday), the reading was 338 microsieverts per hour. That level is still much higher than it should be, but is not dangerous, Mr Ohmura added.