Accession Number : AD0621565

Title :   FILTER PACK TECHNIQUE FOR CLASSIFYING RADIOACTIVE AEROSOLS BY PARTICLE SIZE. PART IV. MATHEMATICAL CONSIDERATIONS.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Mason,Robert M. ; Ryan,Peter C. ; Hill,Sarah L.

Report Date : 09 AUG 1965

Pagination or Media Count : 11

Abstract : Passing an air stream through a sequence of filters having different retentivities effects some classification of radioactive particles by size. Airborne radioactivity has been related to particle size by a system of four simultaneous linear algebraic equations in four unknowns. Each equation expresses the total radioactivity collected on a given filter in terms of the total activity for each size group and the probability for particles of that group being trapped on that filter. A preliminary set of filter pack collection data was used to determine a coefficient matrix for the system based on these probabilities. The system was then applied to new data. This procedure can be applied to a variety of filter pack constructions for relating other characteristics of atmospheric particles to particle size. (Author)

Descriptors :   (*RADIOACTIVITY, PARTICLE SIZE), (*FISSION PRODUCTS, AIRBORNE), (*AEROSOLS, RADIOACTIVITY), (*FALLOUT, CLASSIFICATION), MATHEMATICAL ANALYSIS, ALGEBRA, LINEAR PROGRAMMING, COMPUTER PROGRAMMING, GAS FILTERS, COLLECTING METHODS, AIR POLLUTION, NUCLEAR EXPLOSIONS, RADIOCHEMISTRY, RADIOACTIVE ISOTOPES, ATMOSPHERES, DISTRIBUTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE