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- Undesired radioactive material that is deposited on the surface of or inside structures, areas, objects or people. Source: U.S. Nuclear Regulatory Commission
- Introduction into water, air, and soil of microorganisms, chemicals, toxic substances, wastes, or wastewater in a concentration that makes the medium unfit for its next intended use. Also applies to surfaces of objects, buildings, and various household and agricultural use products.
Source: Terms of the Environment