Changes

[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]A value of a quantity pre-set level expressed in protection quantities above which the cause or the implications of the result an intake should be examined([[ICRP Publication 78]], 1997). Note that investigation levels 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 often set most likely to relate to a measured body or organ/tissue content an activity level in terms of readily measurable quantities, such as contamination per unit area excreta or volumean air concentration measured by a personal air sampler.