In this series of reports deﬁned as a mathematical pool of radioactive materials in the body which can be characterised by ﬁrst-order kinetics. A compartment can be associated with an organ (e.g. the liver) a part of an organ (e.g. the bronchial region of the lungs) a tissue (e.g. the bone) a part of a tissue (e.g. the bone surface) or another substance of the body (e.g. the blood). Activity is considered to be distributed uniformly in a compartment.
(ICRP Publication 130, 2015)
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