Operating fast electron spectrum in layered samples

Developed is a model for determining operation spectra of fast electrons in a multilayered target. The model is based on the principles of the successive collision method and those of the model of continuous slowing down. The dose and spectral distributions are calculated within the model target Ti-air-cellulose triacetate-substratum (Al, Ge, Mo, W) irradiated by a sine-modulated beam of accelerated electrons with maximum energy of 0.35 MeV. It is shown that the quantity of dose distribution in cellulose triacetate depends on the low energy (< or approx. 0.1 MeV) portion of the operating electron spectrum. The results obtained may be employed in predicting or estimating the output of the radiation-stimulated reaction for which cross section is known as a function of the attacking electron energy. (author)