Date: Monday, July 25, 2011 06:32 +0900 (JST)
Japan's nuclear watchdog has released results of their analysis on how radioactive substances spread after the Fukushima Daiichi nuclear plant accident.
The Nuclear and Industrial Safety Agency released data analyzed by a computer forecasting system designed to track the movement of radioactive substances based on wind and weather.
The System for Prediction of Environmental Emergency Dose Information, or SPEEDI, calculated 6 days' worth of data, from March 12th through 17th.
The results show the amount of radioactive substances in the atmosphere, external exposures and accumulation on the ground.
A map from March 12th, a day after the disaster, shows radioactive substances first flowed towards the southeast and then gradually moved north.
The Agency says it calculated the data based on updated figures obtained from the nuclear reactors through June.
The 600 pages of information are available on the internet.
The Agency will provide all the data to Fukushima Prefecture. It wants to use the information when conducting health research for its residents to estimate their amount of radiation exposure.