42
30
3.2. The requirements for planned exposure situations apply to exposure due to
sources within practices
16
, as follows:
(a) Facilities that contain radioactive material and facilities that contain
radiation generators, including nuclear installations, medical radiation
facilities, veterinary radiation facilities, facilities for the management of
radioactive waste, installations for the processing of radioactive material,
irradiation facilities, and mineral extraction and mineral processing
facilities that involve or could involve exposure to radiation or exposure
due to radioactive material;
(b) Individual sources of radiation, including sources within the types of
facility mentioned in para. 3.2(a), as appropriate, in accordance with the
requirements of the regulatory body.
3.3. The requirements for planned exposure situations apply for any
occupational exposure, medical exposure or public exposure due to any practice
or due to a source within a practice as specified in paras 3.1 and 3.2.
3.4. Exposure due to natural sources is, in general, considered an existing
exposure situation and is subject to the requirements in Section 5. However, the
relevant requirements in Section 3 for planned exposure situations apply to:
(a) Exposure due to material
17
in any practice specified in para. 3.1 where the
activity concentration in the material of any radionuclide in the uranium
decay chain or the thorium decay chain is greater than 1 Bq/g or the activity
concentration of
40
K is greater than 10 Bq/g;
(b) Public exposure due to discharges or due to the management of radioactive
waste arising from a practice involving material as specified in (a) above;
16 For example, a sterilization gamma irradiation unit is a source for the practice of
radiation preservation of food. An X ray unit may be a source for the practice of radiodiagnosis.
A nuclear power plant is part of the practice of generating electricity by nuclear fission,
and may be regarded as a single source (e.g. with respect to discharges) or as a collection
of sources (e.g. for purposes of occupational radiation protection). A complex or multiple
installation situated at one location or site may, as appropriate, be considered a single source for
the purposes of application of these Standards.
17 A situation of exposure due to radionuclides of natural origin in food, feed, drinking
water, agricultural fertilizer and soil amendments, construction materials and residual
radioactive material in the environment is treated as an existing exposure situation regardless
of the activity concentrations of the radionuclides concerned.