A BCA-model for displacement damage calculations in polyatomic ionic materials

Damage parameters as defined in the frame of the dpa-concept are commonly u sed to quantify radiation exposure to solid materials. Calculations of such parameters in light mass and polyatomic ionic materials suffer severely fr om limitations of the well-established NRT-Lindhard model, which are due to restrictions of the underlying physics and insufficiencies of the modellin g. To overcome these drawbacks a binary collision approximation (BCA)-model appropriate for this class of materials has been developed and implemented into the code Marlowe. The main issue to be solved was the treatment of io nic compounds and its implications. The influence of the improved BCA-model on damage production and damage characteristics is demonstrated by simulat ing collision cascades in lithiumtitanate Li2TiO3, a candidate tritium bree der in fusion reactor blankets. (C) 2001 Elsevier Science B.V. All rights r eserved.