ALBEDO ALBEZ, Gamma and Neutron Attenuation in Air Ducts

1 - Description of program or function: The programs ALBEDO and ALBEZ are used to calculate the attenuation of scattered radiation in straight or bent air ducts for gamma radiation (0.1-3 MeV) and fast neutrons (0.1-14 MeV). With the programs the following geometries can be treated: - ALBEDO: straight ducts and ducts with one bend; - ALBEZ: ducts with two bends. 2 - Method of solution: In the case of gamma radiation the calculations are based on the Compton effect. The energy and angle dependency of the energy of the scattered photons and the albedo factors for the scattering is based on generally available literature. In the case of neutrons the programs are valid only for fast neutrons. This is the range of validity of the albedo factors in the literature which describe the energy and angle dependencies of the scattered fast neutrons. The loss of energy of the neutrons due to scattering at the surface is neglected. 3 - Restrictions on the complexity of the problem: The programs are restricted for gamma radiation to the energy range of 0.1 to 3 MeV. In the case of neutrons only fast neutrons can be treated in the range of 0.1 to 14 MeV. Furthermore, the albedos used in the codes are valid only for concrete ducts