
Parties engaged in aviation operations must investigate if there is any cause to suspect, that the annual effective dose of an individual worker may exceed 1 mSv. In practice, this applies to all parties engaged in aviation operations at altitudes of more than 8000 metres. The responsible party must implement the radiation protection of aircrews in accordance with the requirements presented in Guide ST 12.4.
An appropriate calculation programme of proven reliability must be used for determining exposure to cosmic radiation. Reliability may be demonstrated, for example, by means of international comparisons.
The calculation programme must:
- be suitable for determining cosmic radiation doses
- be documented and tested
- yield results in the form of effective dose or ambient dose equivalent (see Appendix C and Guides ST 1.9 and ST 7.2)
- be sufficiently accurate: at a confidence level of 95 %, the result must not deviate by more than 33 % below or 50% above the proper value.
Examples of calculation programmes of proven reliability are CARI, EPCARD and FREE.
Aircrew dose are calculated by airline companies.
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Radon measurement methods are approved by STUK. The requirements for the measurement method is represented in Guide ST 1.9. A list of the approved radon measurement methods (in Finnish) is in STUK's website.