Aircrew dose are calculated by airlines on the basis of personnel flight plans combined with dose data for each flight calculated by SIEVERT software (www.sievert-system.org).
Whole body measurements concern the gamma emitters of energy superior to 200 keV (exposure to fission and activation products mainly). Lung measurements concern the X and gamma emitters of lower energies (exposure to actinides). Thyroïd measurements are dedicated to iodine isotopes. All measurements are performed in schielded cells. The used detectors are semi-conductors (GEHP) or scintillators (NaI(Tl)). The identification of radionuclides is based on spectrometry after calibration of the detectors with gold standard sources.
Alpha emitters are detected by global counting or alpha spectrometry after chemical treatment of the sample. Beta emitters are detected by liquid scintillation. Gamma and X emitters are detected by direct spectrometry. The used biological samples are urines, feces, nasal samples, and less often salivary and blood samples.
Occupational doctors are in charge of the internal committed dose assessment.
A national guide (www.chu-rouen.fr/sfmt/autres/Internal_exposure_nuclear_instal_medical_monitoring_nov_2012.pdf) recommends a recording level equal to 1 mSv, but all values sent to the register are taken into account, even those inferior to 1 mSv.
The external exposure to radon is measured by passive dosimetry. The internal exposure to radon is measured with a dedicated individual dosemeter, evaluating several contributions to the internal dose: the alpha potential energy due to short life radon progeny (from direct collect of aerosol) and the contribution of long life radon progeny (from postponed counting of filtered dust activity).