| Abstract from DBPedia | Background radiation is a measure of the level of ionizing radiation present in the environment at a particular location which is not due to deliberate introduction of radiation sources. Background radiation originates from a variety of sources, both natural and artificial. These include both cosmic radiation and environmental radioactivity from naturally occurring radioactive materials (such as radon and radium), as well as man-made medical X-rays, fallout from nuclear weapons testing and nuclear accidents.環境放射線（かんきょうほうしゃせん、英: background radiation / environmental radiation）とは、生活環境中にある放射線を言う。 (Source: http://dbpedia.org/resource/Background_radiation) |
