الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 146 |  |  |
| | | from | 146 | | |
Abstract
The effect of different doses of y-irradiation on the mathematical properties of the seal rubber materials that are frequently used in the nuclear facilities such as y-radiator facility, are studied.
Two groups of rubber blends are developed to investigate and choose the best blend to resist radiation and use in O-ring seals of nuclear facilities.
The first proposed blends group is a mixture of SBR/NBR with different concentration of antioxidant IPPD. While the second proposed group rubber blends designed for investigation the effect of different binary blends such as SBR/NBR, EPDM/NBR, and EPDM/EPM at 1 phr of IPPD on mechanical properties.
A Co60source of gamma facility was used for irradiating samples at different doses up to 1200 Mrad with a rate 0.756 Mrad/hr.
Swelling and tensile tests of rubber blends samples were performed . Three organic solvents namely chloroform, toluene, and benzene have been employed for swelling measurements to assess the assess the crosslinking desity.
The proposed blends exhibited good physic-mechanical properties, against the determination due to exposures to y-irradiation are assigned as a seal material that may be used for nuclear facilities
The results showed that the EPDM/EPM rubber blends have a good physic-mechanical properties and radiation resistance up to 1200 Mrad.
For purpose comparison, two commercial O-ring seal materials that already used in gamma facilities, have been tested under prolonged exposure. It is found that they destroyed only after they were exposure to 500 Mrad and 700 Mrad respectively.