1. Radiation Physics Division;Beck,1979
2. Naturally occurring radionuclides on foods and water from the Brazilian areas of high radioactivity;Eisenbud,1964
3. Background radiation dose estimates in Washington states;Erickson,1993
4. Basics and philosophy of environmental monitoring in Europe;Frenzel,1993
5. Measurement of radioactivity levels in soil in the Nile delta and middle Egypt;Ibrahim;Hlth Phys.,1993