title: Low permeability asphalt concrete gamma ray shielding properties.
abstract: Energy-dependent gamma ray shielding properties were measured as a function of gamma ray energy for a low permeability asphalt concrete that is used as a cap to prevent water infiltration into radioactive waste sites. Experimental data were compared to ISO-PC point kernel shielding calculations. Calculated dose equivalent rates compared well with experimental values, especially considering the poor detector resolution involved. The shielding properties of the asphalt concrete closely resembled those of aluminum. The results presented can be used to determine the asphalt concrete thickness required to reduce dose equivalent rates from several gamma ray emitting radionuclides.
authors.affiliation: Department of Nuclear Engineering, Oregon State University, Radiation Center, Corvallis 97331-5902, USA.
authors.forename: S E
authors.initials: SE
authors.lastname: Binney
authors.forename: K L
authors.initials: KL
authors.lastname: Sykes
mesh_terms: D005720:Gamma Rays; D006801:Humans; D006838:Hydrocarbons / Q000528:radiation effects*; D011835:Radiation Protection
chemical_list: D006838:Hydrocarbons; C006647:asphalt