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  • (chemistry) The process by which the number of particles or photons entering a body of matter is reduced by absorption and scattered radiation. Source: U.S. Nuclear Regulatory Commission
  • (environment) The process by which a compound is reduced in concentration over time, through absorption, adsorption, degradation, dilution, and/or transformation. an also be the decrease with distance of sight caused by attenuation of light by particulate pollution. Source: Terms of the Environment

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