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  • (chemistry) The determination of kinds, quantities or concentrations, and in some cases, the locations, of radioactive material in the human body, whether by direct measurement (in vivo counting) or by analysis and evaluation of materials excreted or removed (in vitro) from the human body.
    Source: U.S. Nuclear Regulatory Commission
  • (environment) A test to determine the relative strength of a substance by comparing its effect on a test organism with that of a standard preparation.
    Source: Terms of the Environment
  • (geology) A determination of the concentration of a substance in biological fluids and tissue by analysis of urine, feces, blood, bone, tissue, etc. ANSI
    Source: Dictionary of Mining, Mineral, and Related Terms

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