56Certain incidents taken to be radiation incidents

#### 56 Certain incidents taken to be radiation incidents 56 Certain incidents taken to be radiation incidents > > (1) For this regulation, a radiation incident is taken to have occurred if— > > > > > (a) there is an unplanned or unexpected emission of, or exposure to a person of, radiation, including as a result of— > > > > > > > (i) the spillage or leakage of a radioactive substance, or > > > > > > > (ii) damage to, or the malfunctioning of, an ionising radiation apparatus or sealed source device, and > > > > > (b) it is likely that— > > > > > > > (i) one or more persons have, or could have, received an effective dose of radiation of at least— > > > > > > > > > (A) for an occupationally exposed person—5 mSv, or > > > > > > > > > (B) otherwise—1 mSv, or > > > > > > > (ii) the premises or the environment may have become contaminated within the meaning of the Act, section 21(4). > > > (2) A radiation incident is also taken to have occurred if the use of a radioactive substance, ionising radiation apparatus or sealed source device for medical purposes results in one or more of the following— > > > > > (a) the administration of a radioactive substance for diagnostic purposes at an activity that exceeds the activity prescribed by 50% or more, > > > > > (b) the administration of a radioactive substance for therapeutic purposes at an activity differing by 15% or more from the activity prescribed, > > > > > (c) the administration of radiation from an ionising radiation apparatus or a sealed source device for therapeutic purposes which differs from the total prescribed treatment dose by more than 10%, > > > > > (d) the administration of radiation from an ionising radiation apparatus for diagnostic purposes, other than in the course of delivering radiation therapy, in a quantity— > > > > > > > (i) of 50% or more of the initial intended dose, and > > > > > > > (ii) that results in a person receiving an effective dose of radiation of at least 1 mSv, > > > > > (e) the administration of radiation— > > > > > > > (i) to the wrong person or to the wrong part of a person’s body, and > > > > > > > (ii) that results in a person receiving an effective dose of radiation of at least 1 mSv, > > > > > (f) the administration of a radiopharmaceutical— > > > > > > > (i) otherwise than as prescribed, and > > > > > > > (ii) that results in a person receiving an effective dose of radiation of at least 1 mSv, > > > > > (g) the administration of radiation for diagnostic or interventional purposes resulting in an unanticipated or unexpected observable acute radiation effect, > > > > > (h) the unplanned exposure of an embryo or foetus to radiation that results in the embryo or foetus receiving an absorbed dose of radiation of at least 1 mGy. > > > (3) In this section— > > > > absorbed dose has the same meaning as in the 2007 ICRP recommendations.