24.—(1) Where any accident or other occurrence takes place which is likely to result in a person receiving an effective dose of ionising radiation greater than 6 mSv or an equivalent dose greater than 15 mSv for the lens of an eye or greater than 150 mSv for the skin or the extremities, the employer must—
(a)in the case of a classified person, arrange for a dose assessment to be made by the approved dosimetry service as soon as possible;
(b)in the case of an employee to whom a dosemeter or other device has been issued in accordance with regulation 13(2), arrange for that dosemeter or device to be examined and for the dose received to be assessed by the approved dosimetry service as soon as possible;
(c)in any other case, arrange for the dose to be assessed by an appropriate means as soon as possible, having regard to the advice of the radiation protection adviser.
(2) In each such case, the employer must—
(a)take all reasonably practicable steps to inform each person for whom a dose assessment has been made of the result of that assessment;
(b)notify the appropriate authority of the result of the dose assessment as soon as possible; and
(c)keep a record or copy of the assessment until the person to whom the record relates has or would have attained the age of 75 years but in any event for at least 30 years from the date of the relevant accident.
(3) In this regulation “appropriate authority” means—
(a)in relation to an accident or other occurrence as a result of work carried out on nuclear premises, the ONR;
(b)otherwise, the Executive.