A convenient, low-cost, time-integrating monitor based on the track-etching technique wasdeveloped for measuring the deposition rate of attached 220Rn progeny indoors. Simultaneousmeasurements for deposition rates and concentrations of 220Rn progeny were performed in 13 housesduring 12 months. Various values were observed among those houses, but seasonal variations werenot clearly observed. The deposition velocity of attached 220Rn progeny was estimated to be(0.53?0.11)?10-2 cm?s-1, in fair agreement with most of the values of attached 222Rn progeny indwellings in the literature.
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