الفهرس | Only 14 pages are availabe for public view |
Abstract Radiation used in various applications such as; Medical uses, Nonmedical of irradiation products, Radiography, Materials analysis, Gauging systems and Miscellaneous uses. The disadvantageous of radiation are causes harmful biological effects in the human body. Radiation protection against radioactive sources is the most important to protect individuals, society and environmental from radiation which ensures the radiation exposure is kept below prescribed limits as low as reasonably achievable (ALARA). Protection against external radiation is fundamentally a question of providing a sufficient distance from the radiation source; limiting the time of exposure to the radiation; and imposing a protective shield between the source and the body to be protected. The design of a radiation protective shield will depend on such factors as the type and characteristics of the radiation sources, type of installation, and the properties of the shield material. Concrete has been used in the construction of nuclear facilities because of two primarily; it’s structural strength and its ability to shield radiation. In this work, experimental studies were performed to assess the attenuation properties of concrete with different ratios of fine and coarses aggregates (barite or ilmenite) which can be used for constructing biological shield for gamma rays. The different properties (physical, mechanical and nuclear) of the produced concrete, barite concrete and ilmenite concrete were investigated. A collimated beam of gamma-rays (60Co) was used to study the gamma spectra behind concrete specimens cylinders, each of 10 cm diameter and of thicknesses vary from 1 to 15 cm. The obtained results showed that adding aggregates (barite or ilmenite) improve the investigated properties of concrete mixes. In addition, 10% ilmenite concrete showed the best results for all the investigated properties. |