comments on this lawsuit and will take appropriate msh sures in accordance with the judicial procedures in the united states." teppco has until april to respond in court. there is no question simmons' health had radically deteriorated since his time on the reagan. but why? the director of the institute for disaster management at the university of georgia is a respected radiation expert who's led seven expeditions to fukushima. >> i think that there was probably some exposure to radiation on the u.s. s ronald reagan, but saying "some" manifests to many people that any exposure to radiation is going to be dangerous. that is actually not the case. >> reporter: dallas said the navy's calculations suggest the radiation exposure of the sailors and marines was about the same as taking a transatlantic flight, or not very much. he says health effects from radiation such as cancer take years or even decades to show up. for dallas and other experts cnn