en Medical Physics Medical Physics تحقيق بديع Original Research <div style="text-align: justify;">Background: This study investigated the &gamma;-rays shielding properties of some building materials in Sudan has been investigated. Materials and Methods: Photons attenuation coefficients and half value layer (HVL) were experimented using Cs-137 and Co-60 sources.&nbsp; The measurements were performed to gauge the intensity of radiation when performed unshielded, the specific thickness of selected samples was examined, using an ion chamber placed at 2 meters from Cs-137 and Co-60. Results: The results indicated that the linear attenuation coefficient (&micro;) possesses a linear relationship with the corresponding densities of the samples studied and inversely with photon energy. HVL was directly proportional with photon energy. Conclusion: As a result of this evaluation the study concluded that selected samples were suitable as shielding material for gamma radiation in Sudanese laboratories.</div> γ-radiation, attenuation coefficient, half value layer, shielding, building materials. 191 196 http://ijrr.com/browse.php?a_code=A-10-2055-101&slc_lang=en&sid=1 M.D.M. Ali 7900319475328460017839 7900319475328460017839 No Physics Department, Sudan University of Science and Technology, Khartoum, Sudan M.E.M. Eisa memeisa@yahoo.com 7900319475328460017840 7900319475328460017840 No Physics Department, Sudan University of Science and Technology, Khartoum, Sudan J.A. Mars 7900319475328460017841 7900319475328460017841 No Department of Medical Bioscience, University of the Western Cape, Private Bag X17, Bellville, of South Africa K.E.M. Mohamadain 7900319475328460017842 7900319475328460017842 No Physics Department, Sudan University of Science and Technology, Khartoum, Sudan A.E. El faki 7900319475328460017843 7900319475328460017843 No Physics Department, Sudan University of Science and Technology, Khartoum, Sudan A. Hamed 7900319475328460017844 7900319475328460017844 No Department of Nuclear Engineering, Sudan University for Science and Technology, Khartoum, Sudan K.J. Cloete 7900319475328460017845 7900319475328460017845 No Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville, South Africa A.A. Beineen 7900319475328460017846 7900319475328460017846 No Sudan Atomic Energy commission, Radiation Safety Institute, Khartoum, Sudan