Abstract
To survey the level and behavior of 222Rn and 220Rn progeny in air, measurements were made intermittently (once a day at an identical time) for 4 years at the campus of the authors' college located in the northeastern part of Japan. A filtration method with alpha spectroscopy, using an evacuated chamber, clearly separated 212Po peak from others. Outdoor and indoor air were sampled every morning except holidays. A definite seasonal variation, higher concentrations in autumn and in winter, was observed except indoor 220Rn progeny. 222Rn progeny revealed log-normal distribution, whereas 220Rn progeny revealed Poisson-like distribution. Multiple regression analysis and correlation analysis indicated that most of indoor 222Rn progeny originates from outdoor air. From time series analysis, several-day periods were often observed, which will probably be attributed to the wind speed.
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