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Japanese the system attributed growing concentrations of cesium-134, with a two-year half-life, and cesium-137, which loses partly its radioactivity on 30 years, to the decay of superior concentrations of iodine-131, which has a half-life of eight days.Edano held residents of five towns and cities to the north and west of the transplant Katsurao, Kawamata, Namie, Iitate and parts of Minami Soma must evacuate in a month if they carry out not already made so. Parts of Namie and Minami Soma are already contained by the 20-kilometer evacuation radius drawn stylish the fundamental days of the accident, while Iitate, Kawamata and Katsurao are afar the 30-kilometer range.Residents of five other areas concerning Hirono, Kawauchi, Naraha and parts of Tamura to the south, and the have a rest of Minami Soma were told they must remain prepared to lucid away soon. Hirono and Kawauchi perjure yourself inwards the outer belt of the current zone, while Naraha and Tamura are past the current 30-kilometer radius.The anti-nuclear band together Greenpeace, which had warned something like elevated radiation levels in vogue towns outside the evacuation zone two weeks past, called Edanos declaration a gain step, but thought evacuations must take place more rapidly than the one-month goal Japan has unbending.