Radiation defect production processes in activated KCl crystals

An investigation is made of radiation defect production processes in KCl, KClTl and KClPb crystals under X‐ray irradiation at 290 and 85 K, respectively, as well as by irradiation with electron pulses with lengths of 50 ps and 5 ns at 290 K. The activator is found to localize electronic excitations near itself in the region of a capture radius R_c ≈ 4a. Besides, the activator leads to an increase of both, the probability of self‐trapped exciton decay into FH pairs and that of survival of F centres due to stabilization of H centres. Thus, the above three effects lead to a nonuniform distribution of F centres with respect to the activator. A mathematical model is developed to explain the experimental results obtained. The existence of Pb v–c2+ V_k centre is also reported.