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  • (RAY-dee-AY-shun) Energy released in the form of particle or electromagnetic waves. Common sources of radiation include radon gas, cosmic rays from outer space, medical x-rays, and energy given off by a radioisotope (unstable form of a chemical element that releases radiation as it breaks down and becomes more stable).

    National Cancer Institute - Cite This Source - This Definition

All > Healthcare > Medicine > Cancer > Breast Cancer

  • (RA'-de-ay'-shun) energy transmitted by waves through space or through some medium' usually referring to electromagnetic radiation when used without a modifier.

    DoD Breast Health Program South - Cite This Source - This Definition

All > Healthcare > Medicine > Cancer > Lung Cancer

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