Microanalysis of radiation damage across a zoned zircon crystal
Palenik, C.S., Lian, J. and Ewing, R.C. (2001) Microanalysis of radiation damage across a zoned zircon crystal. Materials Research Society (Boston, MA).
Presented on: 10/1/2001
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.