The ob jec tive of the study pre sented in this pa per is the anal y sis of in flu ence of dif ferent buildup fac tor forms on a sim u lated ra dio graphic im age. Sim u lated ra dio graphic im ages are ob tained by means of the ray-trac ing tech nique. Scat tered pho tons are mod elled us ing the gen er ally ac cepted geo met ric pro gres sion form, lin ear form and tab u lated data of buildup fac tors. Sim u lated im ages were com pared to the ref er ence re sults ob tained by Monte Carlo cal

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... cu la tion. The best agree ment to Monte Carlo simu lated im ages is achieved for the geo met ric pro gres sion form of buildup fac tor. Key words: sim u la tion of ra dio graphic im age, Monte Carlo, buildup fac tor, ray-trac ing 38 Nu clear Tech nol ogy & Ra di a tion Pro tec tion -1/2009 Nu clear Tech nol ogy & Ra di a tion Pro tec tion Sci en tific pa per