FIELD: filtering materials. SUBSTANCE: filtering material is made as strips of dense uniform layer from sized mixture of ultrathin perchlorovinyl fibers with diameter of about 7 mcm and 0.5-1.2 mcm. Material is used as quantitative filter paper ensuring high accuracy and sensitivity in analysis of aerosols including radioactive ones in environment. EFFECT: higher efficiency. 3 cl, 2 ex
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