A classified person is a designation given in the UK Ionising Radiations Regulations 2017 (IRR17). A classified person is someone who could be exposed to ionising radiation, through occupational exposure including reasonably foreseeable incidents, who could receive more than the following exposures: 6mSv/year whole body effective dose, 150 mSv/year equivalent dose to the extremities, and 15mSv/year to the lens of the eye. It also specifically applies to an employee who works with a source of ionising radiation where a dose rate could deliver a whole body exposure of 20mSv (or 500 mSv to the extremities or 20 mSv to the lens of the eye) within a few minutes from a reasonably foreseeable event.