The release of radioactive substances has been reported, and the central and prefectural governments are implementing evacuation or sheltering for affected residents as a precaution for their safety.This is intended to prevent radiation exposure internally and externally.Though depending upon what routes you took in Fukushima,you don’t have to worry about harmful health effects since the dose will only rise to 1 milli Sv (mSv)even if you keep standing at the main gate where 1015 micro Sv/h (μSv/h) was recorded on March 12.