Abstract
Infrared and optical spectra were measured for synthetic quartz in Y-bar form, as it received progressive dosage of gamma -irradiation. The gamma -induced coloration varied in intensity over different growth regions of the Y-bar, in proportion to the density of aluminium impurities, the latter being dependent on the growth speed of the region in question as well as the polarization effect of the x-axis. From the variations in absorbance within the conventionally designated S4, e2 and A1 absorption bands, we deduce that, over a broad range of dosage, Al-OH defects increased continuously while as-grown OH sites hardly decreased in concentration. This indicates the presence of another kind of as-grown A centre that does not show up in IR absorption. It is most noticeable in the -x region, which, like air-swept quartz, has a low radiation susceptibility.
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