Accession Number:

AD0608720

Title:

FILTER PACK TECHNIQUE FOR CLASSIFYING RADIOACTIVE AEROSOLS BY PARTICLE SIZE. PART 2 ISOTOPIC FRACTIONATION WITH PARTICLE SIZE,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Report Date:

1964-10-28

Pagination or Media Count:

16.0

Abstract:

An evaluation of the relative distribution of some longlived airborne fission products among several ranges of particle sizes was carried out by the radiochemical analysis of individual air filters exposed in a pack. The relative quantities of radioactivity deposited on each of the filters in the packs was found to vary considerably throughout 1963 however, each of the individual isotopes behaves in much the same manner so that the fractionation of isotopes relative to one another is slight. Though isotopic fractionation by filters of different characteristics has not been found to be of great significance, there are indications that a more sensitive separating procedure may show more differences between particles in the extreme size ranges. The differences are not sufficient to invalidate the use of collections made on less than perfect filters for estimating the relative fission product concentrations in the air or for the approximate age determination of bomb debris. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE