Simple method of evaluating absorbed dose in electron-beam processing

The use of semiempirical multilayer depth-dose code EDMULT for evaluating the absorbed-dose coefficient K was studied with a personal computer. When multiplied by the charge per unit area, the coefficient gives the absorbed dose in the sample irradiated by electrons. This relation presupposes the model configuration of the plane-parallel beam normally incident on the four-layer slab absorber. The absorber consists of the accelerator window, the air layer, the sample and the substratum. The initial energies of electrons above 100 keV were considered. The values of K obtained agreed reasonably well with the values in the literature. The absorbed doses estimated from K were compared with the values measured by the radiochromic dosimeter for various sets of irradiation conditions. The r.m.s. deviation of the former from the latter was 6.7%. A calculated example of the effects of different substratum materials is given. (author)