Background Radiation Definition
    noun
  
 Low-intensity, multidimensional microwave radiation present in space: its existence is used to support the validity of the big-bang theory since it is thought to be a remnant of the original explosion.
 Webster's New World 
Low levels of natural radiation existing on earth as a result of high-energy cosmic rays, the radioactive decay of rock, etc.
 Webster's New World 
Ionizing radiation that is naturally present in the environment.
 Wiktionary 
Other Word Forms of Background Radiation
Noun
Singular:
 background radiationPlural:
 background-radiationsBackground Radiation Is Also Mentioned In
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