الفهرس 
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Abstract
With the ever-growing generation and stockpiling of hazardous wastes, responsible storage and disposal of waste forms become extremely important. Waste forms that are placed in the environment must be engineered so that release of hazardous materials is minimized. Methods for realistic estimation of contaminant release must be developed to meet regulations and future standards for long-term storage or disposal of wastes.
Mathematical models are considered as a useful tool throughout the world to assess the radiological safety implications of burying radioactive waste. The main aim of this work is to evaluate the potential contaminant release due to penetrations of a container of immobilized waste for finite backfill using mathematical models.
To achieve this goal, the following investigations are carried out:
1) Review of modeling requirements for a radiological assessment,
2) Survey the mobility and interactions of radionuclides in the geosphere,
3) Restrictive analysis of the transport behaviour will be achieved by numerical solutions of the diffusive-transport equations for constant input concentration to the backfill, and
4) Restrictive analysis of the transport behaviour will be achieved by numerical solutions of the diffusive-transport equations for both the waste form and the backfill.