**Acknowledgements**

The author wants to express her deep conviction and my gratitude with regard to the role promoting nuclear research and development, one of such importance, which Mr M. Remki, the Top Manager of the Algerian Atomic Energy Commission is playing. The author would like to thank Prof. G. Kennedy retired from the Engineering Physics Department, Polytechnique, Montreal, Canada for his comments and suggestions. I am very grateful to my colleagues at the Nuclear Techniques and Applications Division, CRNB, COMENA.
