35 kilometers northwest of Fukushima I Nuclear Power Plant.
Jiji Tsushin (5:42PM JST 9/30/2011):
Ministry of Education and Science disclosed on September 30 that plutonium has been detected from the soil in Futaba-machi, Namie-machi and Iitate-mura in Fukushima Prefecture, which derived from the Fukushima I Nuclear Power Plant accident. According to the Ministry, it is the first detection of plutonium outside the plant.
Readers of this blog have been alerted to the existence of neptunium-239 (which decays into plutonium-239) in the soil of Iitate-mura, so it should be no surprise. It is no surprise at all either that it has taken more than 6 months for the Ministry of (Re-)Education to admit.
Neptunium-239 has reportedly been detected in Date City also. That's even further away from the plant (60 kilometers).