Gamma-Ray Leakage Through A Slit in Lead Shield, (Ii)

Abstract

In continuation of a series of mockup tests for the first Japanese nuclear ship, reactor γ-ray leakage through a double-bend two-dimensional passage in a lead slab was experimentally studied. This zig-zag slit channel is recognized to be an effective device against γ-ray leakage at shield seams. Such leakage may occur through straight passages with normally incident γ-rays, or else with oblique incidence, in the form of streaming. in the case of zig-zag channel, it should be noted that there exist certain incident angles at which the shielding effect is markedly impaired. the components of penetration calculated by ray-analysis method have been compared with experimental results. the existence of a slit in a lead slab increases scattered γ-rays, which are localized near the shield surface, but which spread widely with increasing distance from wall. © 1968, Atomic Energy Society of Japan. All rights reserved.