A Theoretical Evaluation of the Effectiveness of the Biological Shields for the O.5MCi Irradiation Facility

Abstract

The primary shielding and maze designs for the 0.5 MCi Co-60 Gamma Irradiation Facility (OW) of NNRI at Kwabenya have been theoretically investigated for their effectiveness. The 1-D transport code ANISNPC was used to investigate the effectiveness of the primary shields, which include the water pool and the concrete walls, by determining the transmission through them. The intensity of photons scattered along the maze plus that trans-mitted through the intervening walls were used to evaluate the shielding effectiveness of the goods and personnel mazes. The results show that, the facility could accommodate a 1 MCi Co- 60 source if this is consistent with other safety requirements of the facility.