Calcualted annually on the basis of flight records
In vivo measurements are not routinely undertaken.
Radiotoxicological analyses are not routinely undertaken.
Internal committed dose assessments are not routinely undertaken.
No level in place.
Assessment of personal radon exposure is not routinely carried out. Radon control is normally on the basis of area measurements.
Area measurments carried out for assessment of compliance with the national reference level (200Bq/m3) are generally undertaken using long term passive measurements.