Oh yes there is!. Found this in the JAR's after a bit of digging.
JAR-OPS 1.390 Cosmic Radiation
(a) An operator shall take account of the in-flight exposure to cosmic radiation of all crew members while on duty (including positioning) and shall take the following measures for those crew liable to be subject to exposure of more than 1 mSv per year (See ACJ OPS 1.390(a)(1):
(1) Assess their exposure
(2) Take into account the assessed exposure when organising working schedules with a view to reduce the doses of highly exposed crew members (See ACJ OPS 1.390(a)(2));
(3) Inform the crew members concerned of the health risks their work involves (See ACJ OPS 1.390(a)(3));
(4) Ensure that working schedules for female crew members, once they have notified the operator that they are pregnant, keep the equivalent dose to the foetus as low as can reasonably be achieved and in any case ensure that the dose does not exceed 1mSv for the remainder of the pregnancy.
(5) Ensure that individual records are kept for those crew members who are liable to high exposure. There exposures are to be notified to the individual on an annual basis, and also upon leaving the operator.
(b) (1) An operator shall not operate an aeroplane above 15 000m (49 000ft) unless the equipment specified in JAR-OPS 1.680(a)(1) is serviceable, or the procedure prescribed in JAR-OPS 1.680(a)(2) is complied with.
(2) The commander or the pilot to whom conduct of the flight has been delegated shall initiate a descent as soon as practicable when the limit values of cosmic radiation dose rate specified in the Operations Manual are exceeded
(See JAR-OPS 1.680(a)(1))
JAR-OPS 1.680 Cosmic radiation detection equipment
(a) An operator shall not operate an aeroplane above 15 000 m (49 000 ft) unless:
(1) It is equipped with an instrument to measure and indicate continuously the dose rate of total cosmic radiation being received (i.e. the total of ionizing and neutron radiation of galactic and solar origin) and the cumulative dose on each flight, or
(2) A system of on-board quarterly radiation sampling acceptable to the authority is established (See AMC OPS 1.680(a)(2)).