In Finland the action level for the radon concentration in inhaled air is 400 Bq/m~(3) in workplaces where people are working regularly (1600 hours per year). The radon concentration stands for the annual mean of the radon concentration during working time. The responsible party, 408 employers, ordered and sent back 1630 radon measurements during seasons 2005-2007. Passive alpha track detectors of STUK were used for these mainly two-month measurements. The average of radon concentrations was 290 Bq/m~(3) and the median 94 Bq/m~(3). In 260 measuring places the radon concentration was more than 400 Bq/m~(3), and in 94 places was more than 1000 Bq/m~(3), the highest value being 13 300 Bq/m~(3). For 25 employers STUK verified the radon concentration during working time with Alpha Guard measuring equipments.
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