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'''Background radiation''' is the [[radiation]] of man's natural environment originating primarily from the naturally [[radioactive]] [[element]]s of the [[earth]] and from the [[cosmic rays]]. The term may also mean radiation extraneous to an experiment.<ref>[http://www.lbl.gov/abc/Glossary.html Glossary of Nuclear Terms] </ref>

'''Background radiation''' is the [[radiation]] of man's natural environment originating primarily from the naturally [[radioactive]] [[element]]s of the [[earth]] and from the [[cosmic rays]]. The term may also mean radiation extraneous to an experiment.<ref>[http://www.lbl.gov/abc/Glossary.html Glossary of Nuclear Terms] </ref>

There is considerable controversy over whether background radiation is harmful, insignificant, or beneficial <ref>[http://www.radscihealth.org/RSH/Docs/MP99-tokyo.html The Beneficial Health Effects of Low Dose Radiation... and Why] </ref>

There is considerable controversy over whether background radiation is harmful, insignificant, or beneficial <ref>[http://www.radscihealth.org/RSH/Docs/MP99-tokyo.html The Beneficial Health Effects of Low Dose Radiation... and Why] </ref>