Reading of environmental radioactivity level by prefecture [19; 00 March 17, 2011]
4-3-2-4 Radiation survey of environment
Reading of environmental radioactivity level by prefecture [13; 00 March 18, 2011]
Reading of environmental radioactivity level by prefecture [19; 00 March 18, 2011]
Monitoring air dose rates from a series of aircraft surveys across the two years after the Fukushima Daiichi Nuclear Power Station accident
Reading of environmental radioactivity level by prefecture [13; 00 March 19, 2011]
Estimated and measured 1m height environmental radioactivity level at monitoring posts in 47 prefectures (Monitoring Date: Apr 8, 2017)