[en] A description is given of the field application of a technique using CR-39 and LR 115 detectors to determine alpha recoil implanted ²¹⁰Po surface activity on domestic glass artefacts in dwellings. These investigations took place in two small stable rural communities in uraniferous areas of Yugoslavia where between 32% and 74% of contemporary indoor radon levels were found to be above the commonly used Action Level of 200 Bq m^-3 and individual levels as high as 8700 Bq m^-3 were measured. The ²¹⁰Po data is used to retrospectively estimate radon exposures in these communities. Comparisons between the retrospectively estimated radon exposures and those being received at present are made