الفهرس | Only 14 pages are availabe for public view |
Abstract The purpose of this thesis is studying the attenuation of the photons through various samples, normally as photons traverse through a material it gets attenuated, and the degree of attenuation varies from a material to another hence rises a physical properties of a material which is the attenuation coecient, hereby we use gamma-ray detectors to nd the attenuation coecient of various samples and check the liability of using NaI doped with Thallium scintillation detector to be used for such purpose. |