"Radioactive substances from the crippled Fukushima No. 1 nuclear power plant have now been confirmed in all prefectures [in Japan], including Uruma, Okinawa Prefecture, about 1,700 kilometers from the plant, according to the science ministry," reports the Japan daily, the Asahi Shimbun. "The highest combined cumulative density of radioactive cesium-134 and cesium-137 was found in Hitachinaka, Ibaraki Prefecture, at 40,801 becquerels per square meter. That was followed by 22,570 becquerels per square meter in Yamagata, the capital of Yamagata Prefecture, and 17,354 becquerels per square meter in Tokyo's Shinjuku Ward."