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miniscule amounts of radiation. in dallas-ft. worth medical supplies triggered radiation detection there. passengers arriving from japan are getting extra scrutiny when they land. as radioactive waste spews out of the power plant, authorities here are watching the air over the pacific. this new york times animation based on data from a united nations monitoring agency shows how the flume of radioactive pollution might spread to the west coast, although by the time it gets here, it will be highly disbursed. it turns onto a huge volume of air and gets dramatically diluted. reporter: experts say it will be barely detectible on the network of air monitors run by the epa and other governmental agencies. from the white house, this assurance. we do not expect harmful levels of radiation to reach the west coast, hawaii, alaska or u.s. territories in the pacific. people on the west have been