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Wiktionary(0.00 / 0 votes)Rate this definition: background radiation(Noun) ionizing radiation that is naturally present in the environment. Freebase(0.00 / 0 votes)Rate this definition: Background radiation is the ubiquitous ionizing radiation that people on the planet Earth are exposed to, including natural and artificial sources. Both natural and artificial background radiation varies by location.
Blackbody radiation or cavity radiation refers to an object or system which absorbs all radiation incident upon it and re-radiates energy which is characteristic of this radiating system only, not dependent upon the type of radiation which is incident upon it.rom the assumption that the electromagnetic modes in a cavity were quantized in energy with the quantum energy equal to Planck's constant times the frequency, Planck derived a radiation formula.