Standard equations for the kinetics of the concentrations of free and trapped charges have been used to obtain explicit expressions for the radioluminescence intensity and the concentration of induced absorption centers in ruby with a low chromium concentration. It is assumed that such a ruby corresponds to a band model containing one hole level and two electron levels. The calculations are performed for the approximation of arbitrary trap filling. It is shown that: 1) the increase in the recombination cross section at the radioluminescence centers on reducing the temperature reduces the intensity of the induced absorption and 2) the more rapid rise in the performance of the recombination chann e l at the blue-emission centers reduces the proportion of recombinations that lead to emission of the R lines.
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