Research Available Online at www.ijcrr.in International Journal of Contemporary Research and Review ISSN 0976 – 4852 https://doi.org/10.15520/ijcrr/2018/9/08/584 August, 2018|Volume 09|Issue 08| International Journal of Contemporary Research and Review, Vol. 9, Issue. 08, Page no: TC 20193-20206 DOI: https://doi.org/10.15520/ijcrr/2018/9/08/584 Page | 20193 Section: Engineering Comparison of Lead, Copper and Aluminium as Gamma Radiation Shielding Material through Experimental Measurements and Simulation Using MCNP Version 4c Md. Akhlak Bin Aziz 1 , Md. Faisal Rahman 2 , Md. Mahidul Haque Prodhan 3 1 The University of Manchester, Department of Nuclear Science and Technology School of Physics and Astronomy, Manchester M13 9PL, UK 2 Department of Nuclear Engineering, University of Dhaka, Dhaka –1000, Bangladesh 3 Department of Nuclear Engineering, University of Dhaka, Dhaka –1000, Bangladesh Corresponding Author: Md. Akhlak Bin Aziz Received: 2018-07-26; Accepted 2018-08-20, Abstract: The paper compares Lead, Copper and Aluminum as gamma radiation shielding material using both experimental and simulation techniques. Cs- 137 (662KeV), Na-22 (511KeV) and Na- 22(1274KeV) were used as gamma radiation sources and a sodium iodide (NaI) detector was used to detect the radiation. Variations were noted for detected gamma count rates by changing shielding material thickness. In the experimental approach, thickness was varied by placing sheets of a particular test material one by one. For simulation, Monte Carlo n- Particle (MCNP) code version 4c was used and the geometry of the whole experimental setup was plotted in it. The results were then compared for each test material and it was found that lead is the best shielding material for gamma radiation followed by copper and aluminium. Keywords: Gamma Radiation; Radiation Shielding; Monte Carlo n-Particle (MCNP) Code Version 4c; Sodium Iodide Detector. 1. Introduction: The sum of the mass of the neutrons and protons is often less than the mass of the nucleus. The difference in mass is called the mass defect. The defective mass is released by the nucleus as energy, by radiation, to become stable and thus is the source of radioactivity. There are some unstable atoms that disintegrate emitting radiation and forming smaller new atoms. Radiation emitted can be of three types- alpha, beta and gamma. Alpha particle has two protons and two neutrons with a charge of plus and beta particle is just an electron with a charge of minus one. Gamma radiation is an electromagnetic wave with no charge and is the most penetrating. Alpha particles are the most ionizing and least penetrating and can cause severe biological damage if emitted internally [1]. Due to the ionizing power each type of radiation is harmful and must be stopped or reduced below a certain level so that people and environment related to the nuclear