الفهرس 
Theoretical aspects
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Abstract
Ionizing radiation has been found to be widely applicable in
modifying the structure and properties of polymers. Many researches in
polymer radiation has led to numerous applications of commercial and
economic importance, and work remains active in the application of
radiation to practical use involving rubber composite materials.
Silicone rubber has been in point of interest throughout the world
due to their novel applications such in automotive industry, healthcare
supplies and nuclear applications. Therefore, this work deals with the
study of bismuth silicone rubber composite as a gamma ray shielding
material. The mechanical properties of the composite have been
investigated as function of the irradiation dose.
This work is achieved in four chapters, they are summarized
as follows:
CHAPTER ONE: general introduction about rubber material,
their structure, properties, their types and focusing on silicone rubber
which is the material used in this study. Also present literature review of
some related published works given by others.
CHAPTER TWO presents the theoretical aspects of this study
starting by a short description to the main process by which gamma ray
interact with matter, it gives a description and discussion of the main
detectors and measuring techniques which are used for detecting gammarays. Also a brief description to some materials which are used for
constructing shields for gamma radiation sources. In addition, description
and discussing the mechanical properties of rubber.CHAPTER THREE deals with the experimental procedure
through this study according to samples preparation and the experimental
setup for the devices used for gamma ray attenuation and also equipment
used for measuring mechanical parameters including tensile strength ,
elongation at break, young’s modulus and hardness shore A
CHAPTER FOUR presents the resulted data obtained from this
work. These results are divided into two parts, first part deals with the
measurements and calculations for gamma ray attenuation in bismuth
silicone rubber composites under investigation. Part two concerning with
the experimental result obtained by measuring the mechanical properties
of the samples before and after different irradiation doses.