Abstract
ditions due to sources of photon radiation. The main source of errors in calculations of the dose characteristics performed with these methods is incorrectly taking account of the contribution of the scattered photon radiation. Ordinarily, the scattered photon radiation is taken into account by means of dose buildup factors obtained by the method of moments in infinite media with atomic number Z and distance μd between a point isotropic source of photons with energy E0 and a detector – B∞(E0, μd, Z) [1, 2]. However, in most cases the protection must be regarded at least as a barrier, and then it is necessary to know the buildup factors Bbar(E0, μd, Z) for the barrier geometry of the protection. The barrier effect of the protection is usually taken into account by introducing a correction δ. There are many methods for taking this effect into account [1]. It is desirable to represent the correction using a method in which it does not depend on the thickness of the protection. This method was proposed for dose buildup factors [1], where the correction was introduced in the form
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