<P> Background radiation is the ionizing radiation present in the environment . Background radiation originates from a variety of sources, both natural and artificial . Sources include cosmic radiation, and environmental radioactivity from such as naturally occurring radioactive materials including radon and radium, and fallout from nuclear weapons testing and nuclear accidents . </P> <P> Background radiations are the radioactive radiations (such as alpha, beta, gamma rays) to which we all are exposed, even in the absence of an actual radioactive source . </P>

Name one man made source of background radiation