Penetration of multi-energy -rays through double layer shielding slabs

In this paper the calculation of exposure build up factors for photons of three energies (1.6, 6.13 and 7.IOMeV) has been performed applying two different methods namely, the Bowman & Trubey (Bowman and Trubey, ORNL-2609, 1958) and Broder (Broder et al., SOv. At. Energy 12, 26, 1962) formulae, Photon penetration for double shielding slabs of six possible combinations of aluminium (AI), steel (Fe) and lead (Pb) was examined. Transmission dose build up factors obtained in the present study have been compared with those reported recently (Bakos, Ann. Nucl. Energy 21, 725, 1994) using the Harima & Nishiwaki formula