Abstract
Characteristics of four methods of dust sampling which are now generally used to collect dusts in the atmosphere, i.e. those with pot collection, gummed paper, filter paper and electric precipitator, were compared. Radioactive fall-out and atmospheric pollutants were used as dust specimens. The efficiency of dust sampling of electric precipitator was better than that of filter paper when the amount in weight of dust collected was to be expressed, but vice versa when the efficiency was to be expressed in radioadtivity per unit air volume and per unit weight of dust. On the other hand, the sampling method with pot collection or gummed paper was considered inadequate for determining a concentration of atmospheric pollutants and only available to estimate a distribution or a trend of variation of atmospheric pollutants. And, it was found that the kinds of dust collected differed from each other when different sampling methods were used.
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