Abstract
Simplified models are presented, simulating the irradiation of lithium fluoride single crystals. In these models the evolution of the primary defect concentration versus the number of Frenkel pairs, induced at random in the lattice, is studied from a statistical point of view. The maximum defect concentration follows as a consequence of postulated annihilation volumes in which a newly created primary recombines with one of its antidefects. The fact whether single or di-atomic interstitials are considered has only a minor effect on the maximum defect retention.

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