Identify the types of unused closed radioactive sources that are considered one of the most important radioactive waste at all due to the concentration of the radioactive material in them and the high radiation power and their use in some services and industrial measurements, in diagnosis and treatment and in research and development programs - the nature of ionizing radiation and the extent of risk associated with these sources and preventive measures from radiation Ionizing - Safe Transport - Methods for Preservation, Storage and Burial of Radioactive Sources.