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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
A dose rate above which there is, for a given taxonomic class, a defined chance of deleterious effects of ionising radiation on individuals of a species that may lead to consequences at the population level. 

(Adapted from [[ICRP Publication 136]], 2017)

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== Previous glossary entries ==

=== from [[ICRP Publication 136]], 2017 ===

A band of dose rate within which there is likely to be some chance of deleterious eﬀects of ionising radiation occurring to individuals of that type of Reference Animal or Plant (derived from a knowledge of deﬁned expected biological eﬀects for that type of organism) that when considered together with other relevant information can be used as a point of reference to optimise the level of eﬀort expended on environmental protection dependent upon the overall management objectives and the relevant exposure situation.