Determining The Natural Radiation Level And Gamma Absorption Coefficient Of İkizdere Obsidian

Abstract

In the present work, natural radionuclide levels and mass attenuation coefficient of obsidian samples taken from Rize İkizdere region were investigated. The mass attenuation coefficient (μ ρ-1) is investigated experimentally and theoretically for 14 İkizdere obsidian rocks. The mass attenuation coefficients of the samples were measured experimentally at photon energies of radioisotopes 133Ba (81 keV, 302 keV, 356 keV), 137Cs (662 keV), Theoretically, the simulation results of μ ρ-1 using XCOM code was compared with experimental results. In addition, elemental analyzes of obsidian samples were made. Average 238U, 232Th and 40K activities were determined as 93±9, 67±7, 1027±19 Bq m-3, respectively. The absorption coefficient of obsidian at 356 and 662 keV energies is not much different from other rocks.