Cosmogenic 21Ne and 22Ne depth profiles in chondrites

Bhandari, N. ; Potdar, M. B. (1982) Cosmogenic 21Ne and 22Ne depth profiles in chondrites Earth and Planetary Science Letters, 58 (1). pp. 116-128. ISSN 0012-821X

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The production rate profiles of 21Ne and 22Ne as a function of depth in meteoroids due to spallation by solar flare cosmic rays (SCR) and galactic cosmic rays (GCR) are calculated and their dependence on size and composition of meteoroids has been evaluated. The GCR production rate at a given depth increases with size for radii <25cm and then decreases whereas the 22Ne 21Ne ratio (NeR) generally decreases with size and depth. The calculated GCR production rates and NeR are consistent with the measurements in several Chondrites. A plot of track production rate vs. NeR shows that some chondrites have NeR values smaller than those expected for their sizes. Thes obeervation suggestsat least a two-stage irradiation for such meteorites; the meteoroid exposure as a small body in the interplanetary space must have been preceded by exposure under deep shielding, possibly in its parent body.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:18492
Deposited On:17 Nov 2010 09:05
Last Modified:17 May 2011 12:23

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