Abstract
Bare Kodak LR-115 films have been used as detectors in the survey of radon in Finnish dwellings. The calibrations were made in a 8 m3 walk-in chamber under different equilibrium ratios and for very low equilibrium factors in a smaller 6 litre chamber. Within the experimental uncertainties, the results do not contradict the hypothesis that the efficiency of the film is the same for radon and its alpha active daughters. The radon gas calibration coefficient K was calculated for equilibrium factor F = 0.446 and was 20.0 Bq.m-3.d per tracks.cm-2. Errors in the method are discussed. Systematic errors due to the equilibrium ratio are calculated in three cases; radon gas measurements with bare films and alpha energy measurements with bare films and films in cups.
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