الفهرس 
Theoretical AspectsOnly 14 pages are availabe for public view
 |  | from | 179 |  |  |
| | | from | 179 | | |
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.