FILTER PACK TECHNIQUE FOR CLASSIFYING RADIOACTIVE AEROSOLS BY PARTICLE SIZE.
Part 5 of final rept.,
NAVAL RESEARCH LAB WASHINGTON D C
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During the past several years, a number of collections of radioactive aerosols in the atmosphere have been made on packs of filters, of different characteristics, through which an air stream passes sequentially. The radioactivity distribution on the filters has been related to the sizes of the particulate matter in the atmosphere with which the radioactivity was associated. Conditions have been developed for obtaining size distributions in 3 or 4 size groups, in the submicron range, through use of packs consisting of 3 or 4 well-characterized filter media operated in two convenient air flow regimes, 60-70 cmsec and 145 cmsec. Simple two-filter packs can be employed to monitor the behavior of particulate matter in a restricted size range e.g., either the 1.0 micron-diameter component or the 0.3 micron-diameter component. The general method is applicable to the sizing of any aerosol material for which suitable analytical techniques are available. Gross beta activity levels and concentrations of specific radionuclides in the atmosphere at Washington, D. C., have been documented for the period January 1965 through July 1966. Author
- Radioactivity, Radioactive Wastes and Fission Products