Albedo Component of Gamma Rays Passing Through a Cylindrical Duct

The albedo component of gamma rays passing through a straight cylindrical lead duct has been investigated experimentally for reactor leakage gamma rays impinging on the duct mouth at various angles of 0 through 90°. The distribution of the albedo component along the duct axis may be expressed in the form F(α)·(Z/a)^-3 within the range of Z/a investigated. The contributions from multiple-reflection components to total dose have also been inferred. Also obtained were the radial distributions in both horizontal and vertical directions within and behind the duct., For a duct with one bend of 90°, the gamma-ray dose contributions arising from scattering areas located in both the first leg and the second leg have been determined separately for the incident beam angle of 0° with respect to the axis of the first leg.