Abstract
The accident at Fukushima Daiichi Nuclear Power Plant occurred after the Great East Japan Earthquake Disaster resulted in the release of radionuclides to atmosphere. Although data on ambient dose rates measured at monitoring posts have been released since the accident, there is no comparison of ambient dose rate with external radiation dose evaluated by personal dosimeters. In this study,we evaluated differences between ambient dose rates measured at Fukushima city office and individual external radiation dose evaluated by personal dosimeters.
Doctors, nurses and radiological technologists who were dispatched from Nagasaki University Hospital as members of disaster relief team during March 15 and July 27 participated in this study(n=7). All members worked mainly at Fukushima Medical College Hospital, Fukushima city.
The maximum ambient dose rate of the Fukushima city was 12.34μSv/h on March 18, and the minimum was 0.94μSv/h on July 23. On the other hand, maximum individual external radiation dose was 1.63μSv/h and minimum was 0.08μSv/h. All personal external radiation doses were below ambient dose rate at the corresponding dates. Our results suggested that individual external radiation exposure dose is much lower than ambient dose rate in Fukushima. Further evaluation is needed to clarify the individual external radiation doses in general population of Fukushima.
