Correction factors for determination of annual average radon concentration in dwellings of Poland resulting from seasonal variability of indoor radon

The method for the calculation of correction factors is presented, which can be used for the assessment of the mean annual radon concentration on the basis of 1-month or 3-month indoor measurements. Annual radon concentration is an essential value for the determination of the annual dose due to radon inhalation. The measurements have been carried out in 132 houses in Poland over a period of one year. The passive method of track detectors with CR-39 foil was applied. Four thermal-precipitation regions in Poland were established and correction factors were calculated for each region, separately for houses with and without basements.

► Using radon concentration results in houses we calculated the correction factors.
► Factors were calculated for each month, 2 house types in different regions in Poland.
► They enable the evaluation of average annual radon concentration in the house.
► Annual average radon concentration basing on 1 or 3 months detector exposure.