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Microanalysis of Radiation Damage Across a Zoned Zircon Crystal

Published online by Cambridge University Press:  21 March 2011

Chris S. Palenik
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, U.S.A.
Rodney C. Ewing
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, U.S.A. Department of Nuclear Engineering and Radiological Sciences, University of Michigan Ann Arbor, MI 48109-2104, U.S.A.
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Abstract

An oscillatory-zoned single crystal of zircon (ZrSiO4) from Sri Lanka (560 Ma) provides a unique opportunity to study radiation effects over the dose range of 2.1 - 10.6·1015 á-decay events/mg (0.1 - 0.5 dpa). Each zone has a different radiation dose due to variations in the U (0.09 - 0.53 wt %) and Th (0 - 0.11 wt %) content, but all zones share the same thermal history. The zones span a nearly complete range of microstructures from crystalline to aperiodic. Measurements of birefringence show an inverse-linear correlation with dose over the range of doses observed. Micro-Raman spectroscopy results show that a decrease in peak frequency relative to an undamaged zircon, peak broadening and decreases in peak intensity occur with the accumulation of radiation damage.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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