/Docs/G/Org-IAEA-Safety-GSR3-CmA/Sec/5_Existing_0.md
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OCCUPATIONAL EXPOSURE
Scope
  1. The requirements in respect of occupational exposure in existing exposure situations (paras 5.25–5.33) apply to any occupational exposure arising from the situations specified in para. 5.1.
Requirement 52: Exposure in workplaces
The regulatory body shall establish and enforce requirements for the protection of workers in existing exposure situations.
  1. The requirements in respect of public exposure stated in paras 5.7–5.9 shall be applied for protection and safety for workers in existing exposure situations, other than in those specific situations identified in paras 5.26–5.33.
Remediation of areas with residual radioactive material
  1. Employers shall ensure that the exposure of workers undertaking remedial actions is controlled in accordance with the relevant requirements on occupational exposure in planned exposure situations as established in Section 3.
Exposure due to radon in workplaces
  1. The regulatory body or other relevant authority shall establish a strategy for protection against exposure due to 222Rn in workplaces, including the establishment of an appropriate reference level for 222Rn. The reference level for 222Rn shall be set at a value that does not exceed an annual average activity concentration of 222Rn of 1000 Bq/m3, with account taken of the prevailing social and economic circumstances.57
  2. Employers shall ensure that activity concentrations of 222Rn in workplaces are as low as reasonably achievable below the reference level established in accordance with para. 5.27, and shall ensure that protection is optimized.
  3. If, despite all reasonable efforts by the employer to reduce activity concentrations of radon, the activity concentration of 222Rn in workplaces remains above the reference level established in accordance with para. 5.27, the relevant requirements for occupational exposure in planned exposure situations as stated in Section 3 shall apply.
Exposure of aircrew and space crew due to cosmic radiation
  1. The regulatory body or other relevant authority shall determine whether assessment of the exposure of aircrew due to cosmic radiation is warranted.
  2. Where such assessment is deemed to be warranted, the regulatory body or other relevant authority shall establish a framework which shall include a reference level of dose and a methodology for the assessment and recording of doses received by aircrew from occupational exposure to cosmic radiation.
  3. In accordance with para. 5.31:
    1. Where the doses of aircrew are likely to exceed the reference level, employers of aircrew:
      1. Shall assess and keep records of doses;
      2. Shall make records of doses available to aircrew.
    2. Employers:
      1. Shall inform female aircrew of the risk to the embryo or fetus due to exposure to cosmic radiation and of the need for early notification of pregnancy;
      2. Shall apply the requirements of para. 3.114 in respect of notification of pregnancy.
  4. The regulatory body or other relevant authority shall establish, where appropriate, a framework for radiation protection that applies to individuals in space based activities that is appropriate for the exceptional conditions of space. While the requirements of these Standards in respect of dose limits do not apply to individuals in space based activities, all reasonable efforts shall be made to optimize protection for individuals in space based activities by restricting the doses received by such individuals while not unduly limiting the extent of such activities.