On the Second-Order Decay of the Thermoluminescence of Polycrystalline Materials

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Abstract
The results of an isothermal decay and glow‐curve experiment for a thermoluminescent material having second‐order kinetics have been investigated. In contrast to the first‐order case, the location of the peak of the glow curve depends on the initial trap density. The effect of a distribution of trap densities for a polycrystalline material is investigated. It is found that for a narrow distribution function, a plot of the reciprocal of the square root of the light intensity versus the time in the isothermal decay experiment will give a straight line whose slope and intercept will depend on the distribution function. The location of the peak of the glow curve is not materially affected by the distribution function, and from its location and the energy of the trap depth, a parameter proportional to the initial trap density and independent of the optical efficiency can be determined. Plots of first‐ and second‐order generalized glow curves are presented from which the parameters of an experimental curve can be determined.

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