Depth and size dependence of Mn-53 activity in chondrites

Details Depth and size dependence of Mn-53 activity in chondrites Depth and size dependence of Mn-53 activity in chondrites

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..51...45b&link_type=abstract

Earth and Planetary Science Letters, vol. 51, no. 1, Nov. 1980, p. 45-57.

Computer Science

11

Chondrites, Depth Measurement, Manganese Isotopes, Meteoritic Composition, Radioactivity, Size Determination, Aluminum Isotopes, Core Sampling, Data Correlation, Nuclides, Radioactive Isotopes, Meteorites, Chondrites, Manganese, Isotopes, Depth, Size, Comparisons, Madhipura Meteorite, Udaipur Meteorite, Bansur Meteorite, Aluminum, St. Severin Meteorite, Cosmic Ray Tracks, Production Rates, Diagrams, Data, Experiments, Procedure, Analysis, Radius, Iron, Nickel, Shape, Samples

Scientific paper

The dependence of Mn-53 activity in core samples from four chondrites on sample shielding depth and the pre-atmospheric size of the meteorite is investigated. Cosmogenic Mn-53 activity and cosmic ray track densities were measured at various depths in cores from the Madhipura, Udaipur, Bansur and St. Severin chondrites. Track density analyses indicate effective radii of 6.5, 9, 15 and 25 cm for the meteorites in space, respectively. The depth profiles of Mn-53 activity reveal that the nuclide production rate at any given depth increases with meteorite size, while the activity profile for meteorites with effective radii less than or equal to 15 cm is nearly flat for shielding depths greater than 3 cm and that for meteorites about 25 cm in radius increases by about 40% from near the surface to the center, indicating the importance of the secondary cascade at radii greater than 15 cm. The profiles are then used to determine the spectral hardness parameter as a function of depth which is in turn used in the calculation of production profiles for Al-26 which are found to be in agreement with observations.

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