reg 12 Continued working of overexposed crew
(1) No operator may employ or engage a crew member who has received an overexposure to perform duties on board an aircraft ... that would render the crew member liable to receive an effective dose of cosmic radiation that exceeds X mSv for the remainder of the calendar year. (2) In paragraph (1), “X” is the lower of— (a) the dose limit applicable to the crew member divided by 365 and multiplied by the number of days in the remainder of the calendar year; and (b) the dose limit applicable to the crew member minus the effective dose of radiation received by the crew member for the calendar year to the date on which the crew member received the overexposure, excluding the dose resulting in the overexposure. (3) An operator employing or engaging a crew member who has received an overexposure to perform duties on board an aircraft ... must inform the crew member of the dose limit applicable to the crew member. (4) Where an overexposure received by a crew member was caused by exceptional circumstances beyond the control of the operator, the dose resulting in the overexposure is not to be included in any assessment of the crew member's effective dose for the purposes of article 5 (prohibition on exposure) and article 26 (offences and penalties). (5) In this article— (a) the “dose limit applicable to the crew member” is— (i) where the crew member is performing duties for an operator not authorised under article 5, 1 mSv; (ii) where the crew member is performing duties for an operator authorised under article 5— (aa) for classified crew members, 20 mSv; (bb) for all other crew members, 6 mSv; (b) the “remainder of the calendar year” begins with the day after the date on which the crew member received the overexposure and ends with the last day of the calendar year.