Accession Number : AD0707709

Title :   THE FILTRATION OF PARTICLES OF ATOMIC DIMENSIONS.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Saunders,A. W. , Jr. ; Patterson,R. L. , Jr. ; Lockhart,L. B. , Jr

Report Date : 12 MAY 1970

Pagination or Media Count : 25

Abstract : Particles of atomic dimensions, as typified by the primary decay products of radon, are readily removed from an air stream by passage through coarse fibrous filters or even through screens, while the radon parent is unaffected. The inverse relationship between the efficiency of removal and the air velocity indicates that diffusion is the mechanism primarily responsible for deposition of these small particles. However, if the particles become attached to aerosols, their collection is governed by aerosol behaviors where collection depends both on filter characteristics and air velocity. These particles are readily collected on aerosol particles and provide a radioactive tag by which aerosol or filter behavior may be studied. Such measurements can be extended to size ranges and concentration levels below those convenient for other techniques. (Author)

Descriptors :   (*RADIOACTIVE WASTES, *FLUID FILTERS), (*RADON, *ATMOSPHERIC MOTION), (*AIR POLLUTION, ATMOSPHERIC MOTION), FALLOUT, AEROSOLS

Subject Categories : Meteorology
      Radioactiv, Radioactive Wastes & Fission Prod

Distribution Statement : APPROVED FOR PUBLIC RELEASE