1. Department of geology, North Tehran Branch; Islamic Azad University; Tehran Iran
2. Research institute for earth sciences, geological survey of Iran; PO Box 13185 1494 Tehran Iran
3. Center des Faibles Radioactivites (CNRS-CEA). Avenue de la Terrasse.F.91198 Gif-sur-Ycette Cedex; France
4. Geologicalsurvey of Iran; PO Box 13185 1494 Tehran Iran