Department of Physics;
College of Science;
University of Mosul;
Mosul;
Iraq;
Department of Physics;
College of Science;
Kerbala University;
Kerbala;
Iraq;
Department of Physics;
Faculty of Science;
University of Zakho;
Duhok;
Iraq;
Gamma Rays; Attenuation Coefficient (Linear and Mass); Building Materials; Sodium Iodide Detector;