Abstract
This paper discusses the radiation tolerance, afterglow, and IR absorption spectra of
CsI:Tl crystals grown with an addition of the salt NaNO<sub>3</sub>. Crystals 250mm in diameter and 360mm high are grown by a modified Kyropoulos method with replenishment of the
melt, using a special crucible-feeder design. It is shown that adding 0.5 mass% NaNO<sub>3</sub> to the feeder makes it possible to obtain crystals whose IR spectra
includes an absorption band not of nitrate but of nitrite ions. The resulting
crystals possess low afterglow (a factor of two less than with CsI:Tl) and maintain
radiation tolerance to a dose of at least 10<sup>3</sup>Gy, and this increases the possibilities of using them in practice.
© 2009 Optical Society of America
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