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Diagnostic reference level

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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
 
A diagnostic reference level is a form of investigation level used as a tool to aid in optimisation of protection in the medical exposure of patients for diagnostic and interventional procedures. It is used in medical imaging with ionising radiation to indicate whether in routine conditions the amount of radiation used for a specified procedure is unusually high or low for that procedure. For nuclear medicine the administered activity (amount of radioactive material) or preferably the administered activity per unit of body weight is used. Also see ‘DRL quantity’.