Investigation level

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A pre-set level expressed in protection quantities above which the cause or the implications of an intake should be examined (ICRP Publication 78, 1997). ILs can be set for any operational parameter related to the individual or to the working environment. For individual monitoring of exposure to intakes of radionuclides they are most likely to relate to a measured body or organ/tissue content an activity level in excreta or an air concentration measured by a personal air sampler.

(See also derived investigation level, and threshold level).

ICRP Publication 130, 2015

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