Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..312h&link_type=abstract
(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge
Physics
4
Aluminum 26, Chondrites, Cosmic Rays, Manganese Isotopes, Meteoritic Composition, Particle Production, Coincidence Circuits, Cosmochemistry, Neutron Activation Analysis, Radioactive Age Determination, Silicon, Spallation, Meteorites, Aluminum 26, Production Rate, Manganese 53, Isotopic Ratios, Bombardment, Radionuclides, Laboratory Studies, Samples, Meteorite, Exposure Age, Depth, Procedure, Catalog, Chondites, Stony Meteorites, C Chondrites, H Chondrites, L Chondrites, Ll Chondrites, Silicon
Scientific paper
The long-lived spallogenic radionuclides Al-26 and Mn-53 were systematically studied in a large number of nonantarctic meteorites by nondestructive gamma-gamma-coincidence technique and neutron activation, respectively. From the Al-26-activities normalized to the main target element, silicon, an average production rate of 298 + or - 55 (dpm/kg Si/equ/) was derived. Baed on 15 chondrites with exposure ages equal to or greater than 12,000,000 a and depth profiles of Dhurmsala and Keyes, an average production rate ratio (Mn-53/Al-26)(prod) = 1.48 + or - 0.15 (dpm/kg Fe / dpm/kg Si/equ/) was calculated, which seems to be depth-independent for meteorites with preatmospheric radii R less than 35 cm. Mn-53/Al-26-radiation ages for 29 stones with short exposure ages were determined. A comparison of the results with the respective Mn-53 and Ne-21-exposure ages generally shows a good agreement. The cosmic ray bombardment age scale covered by this method is the range for T(rad) from 1,000,000 to 10,000,000 a.
Englert Peter
Herpers Ulrich
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