Semiempirical models for depth-dose curves of electrons in matter

The basic principle of a semiempirical model, proposed by Kobetich and Katz, for depth-dose curves of electrons in homogeneous semi-infinite absorbers is described. The development, by the present author and his co-worker, of an algorithm based on this model is reviewed. A possible method of further improvement of the algorithm is briefly described, and examples of new Monte Carlo data to aid the improvement are shown. An outline and some examples of application are also described of a semiempirical model for multilayer absorbers. (author)