hiroki yajima, nhk world, fukushima. >>> hiroki spent a lot of time with the people who carry out the tests. researchers at fukushima medical university studied the results. hick oaki spoke with one of them about his work. >> reporter: professor, you study the internal effects of radiation and you have spent some time explaining those effects to worried residents. ha does the science tell you? >> at this point there have been no data indicating exposure levels that would affect human health. to give you a specific example, some residents of iitate village, a municipality evacuated after the accident were tested using whole-body counters. but the level detected cannot be considered harmful. they want more precise information. local government authorities have responded by acquiring five full body counters and steadily moving forward with the tests. >> we have spent some time since the disaster comparing the accident at fukushima with the one at chernobyl. what in your view are the main differences? >> uh-huh. in chernobyl, the nuclear reactor itself exploded. that led to a massive rele