1. Analysis of the concentration of natural radionuclides in rivers in Kota Tinggi district, Malaysia;Ahmad-Taufek;J. Nucl. Relat. Technol.,2004
2. Azevedo, H.L., Amaral, E.C.S., Godoy, J.M., 1984. Evaluation of 226Ra and 210Pb contamination on sediments of the receiving of Brazilian uranium mining and milling and their transport downstream. Progress report for IAEA Research Contract No. 3431/RB, Vienna.
3. Food and Agriculture Organization of The United Nations. 〈http://www.fao.org〉 (accessed January 2008).
4. International Atomic Energy Agency, 1990. The environmental behaviour of radium. Technical Report Series, vol. I–II, no. 310, International Atomic Energy Agency, Vienna.
5. Th-228/Th-232 and Pb-210 geochronologies in marine and lake sediment;Koide;Geochim. Cosmochim. Acta,1973