Recent papers in the American Mineralogist have described refined thermoluminescence measuring apparatus for minerals (Ashby and Kellagher, 1958; Lewis, et al., 1959). The heating rate used for these is about 2° C. per second or less. Slow heating rates were first used in this laboratory (Saunders, 1953), but a fast heating instrument has been found to be more sensitive to low levels of thermoluminescence and increases the number of determinations which can be made per hour. A consequence of the fast-heat feature, however, is a decrease in temperature control and precision. Houtermans, et al. (1957) has also described a fast heating thermoluminescence instrument and discusses its relative advantages.

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