Abstract
Dose dependences of the creation of F−, Mg +- and Mg 0-centres in LiF: Mg crystals under thermal neutron irradiation have been studied experimentally and theoretically. Concentrations of the F− and Mg +-centres were measured by optical absorption, and by photoluminescence for the Mg 0-centres. A model of a heavy charged particle track with a radial dose distribution generated by delta electrons was used for computing the dose distributions in a thermal neutron track. The dose distribution in the irradiated crystal was calculated using convolutions of the dose distribution in single tracks. Mean concentrations of the centres were determined by integration of the yield at some point as a function of the local dose. The experimental dose dependences of the F− and Mg +-centres production are in good agreement with the calculations, but experimental points for the Mg 0-centres are regularly shifted from the calculated curve. This effect, caused by the micromechanism of creation of this centre, is discussed.
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