The explosion and fire at the Japanese Nuclear Plant in NorthEast of Japan has led to the release of a small nuclear plume above the reactors.The southern winds have caused this radiation to spread in many of the prefectures in Japan and cesium and other radioactivity has been detected in the capital of Tokyo.Note Radiation does not affect the human body in small doses as radiation is present in our everyday lives at well.However the increase in radiation concentration can lead to severe health hazards and in extreme cases even death.It is almost impossible to escape radiation effects unless one has special nuclear,biological warfare protective equipment.Note Radiation in Japan is still at quite mild levels and seems unlikely to cause any major health hazard.Radiation will need to increase about 1000 times from the current level for the situation to become serious as of now