Dose Limits:
B1.1 Occupational Exposure
B1.1.1 Dose Limits
B1.1.1.1 The level of occupational exposure of any staff member should be controlled so that it does not exceed the following limits:
a) The annual average effective dose for five consecutive years as determined by the auditing and management department (but not subject to any retrospective averaging)
b) The effective dose in any one year, 50 mSv;
c) The annual equivalent dose to the crystalline lens of the eye, 150 mSv;
d) The annual equivalent dose to the limbs (hands and feet) or skin, 500 mSv.
B1.1.1.2 For apprentices aged 16-18 years who are receiving employment involving radiation exposure and those aged 16-18 years who are receiving employment involving radiation exposure, the following limits shall apply:
B1.1.1.1 For apprentices aged 16-18 years who are receiving employment involving radiation exposure and those aged 16-18 years who are receiving employment involving radiation exposure B1.1.1.2 For apprentices aged 16 to 18 years who are undergoing training for employment involving radiation exposure and for students aged 16 to 18 years who are required to use radioactive sources in the course of their studies, occupational exposure shall be controlled so that the following limits are not exceeded;
a) annual effective dose, 6 mSv;
b) annual equivalent dose to the crystalline lens of the eye, 50 mSv;
c) annual equivalent dose to the extremities (hands and feet) or to the skin, 150 mSv.
B1.1.1.3 The annual equivalent dose to the skin shall be the same as the annual dose to the hands and feet. then the effective dose for a single year may be increased to 5 mSv;
c) Annual equivalent dose to the crystalline lens of the eye, 15 mSv;
d) Annual equivalent dose to the skin, 50 mSv.
B1.2.2 Dose Limits for Comforters and Visitors
The dose limits set out in B1.2.1 do not apply to comforters of patients (e.g. persons who voluntarily assist in the care, support and visitation of patients undergoing medical diagnosis or treatment when it is not their responsibility to do so and when they know that they will be exposed). However, the exposure of patient visitors should be limited so that the dose they receive during the diagnosis or treatment of the patient does not exceed 5 mSv. The dose to children visiting patients who have ingested radioactive material should be limited to less than 1 mSv.