1. Natural radioactivity of ground and drinking water in some areas of upper Egypt.;Ahmed;Turkish J Eng Env Sci,2004
2. Radon levels in sub-soil and local building materials.;Andam;J Radiat Protect,1994
3. Determination of radionuclide levels in soils and water around cement companies in Port Harcourt, Nigeria.;Avwiri;Nigeria J Applied Sci Environmental Management,2005
4. A survey of environmental gamma radiation levels of some areas of Ekiti and Ondo States, Southwestern Nigeria.;Ajayi;Nigeria J Phys,1999
5. The natural radioactivity of surface soils in Ijero-Ekiti, Nigeria.;Ajayi;Nigeria J Phys,1995