Accession Number : AD0613750

Title :   SEARCH FOR ALUMINUM-26 IN DUST FROM THE GREENLAND ICE SHEET,

Corporate Author : SMITHSONIAN ASTROPHYSICAL OBSERVATORY CAMBRIDGE MASS

Personal Author(s) : Fireman,Edward L. ; Langway,Chester C. ,Jr.

Report Date : 29 JUL 1964

Pagination or Media Count : 8

Abstract : Large volumes of approximately 250-year-old Greenland glacier ice were filtered. Approximately 20,000 liters passed through 0.45 micron retention paper with a 2.5 ft surface area, and approximately 200,000 1. passed through 3 micron retention paper. Less than 4 x 10/> dpm/1. of aluminum-26 was found in the 3 micron collections, and less than 3 x 10/6 dpm/1. in the 0.45 micron collection. These limits are significant for determinations of the exposure age, the chemical composition, and the accretion rate of extraterrestrial dust. For an accretion rate for the Earth of a million tons per year of silicates, the limit of 4 x 10/> dpm/1. corresponds to an exposure age of 4000 years. Although the filter collections do not contain aluminum-26, they do contain radioactivities. The principal one is thallium208, a thorium decay product attributed to terrestrial material in the collection. There is also a small positron activity, which disappeared with the purification of aluminum. (Author)

Descriptors :   (*GEOCHEMISTRY, GREENLAND), (*ALUMINUM, GEOCHEMISTRY), (*GREENLAND, GEOCHEMISTRY), METEORITES, ISOTOPES, EXTRATERRESTRIAL TOPOGRAPHY, DUST, ICE, COLLECTING METHODS, GEOLOGIC AGE DETERMINATION, RADIATION MEASURING INSTRUMENTS, ASTROPHYSICS, GEOPHYSICS, SILICATES, THALLIUM, THORIUM

Distribution Statement : APPROVED FOR PUBLIC RELEASE