Dr. A.C. Nwankpa and Mr. S.N. Nwankpa
Department of Physics, Adeyemi College of Education, Ondo.
Anambra State College of Health Technology, Obosi.
Abstract: Committed Effective Doses from the Consumption of Vegetables Cultivated in Awka, Anambra State, Nigeria.
Samples of some vegetables of nutritive importance to both the child population and the adult population in Nigeria were collected in Awka, Anambra State and analyzed in order to determine their radionuclide contents. Gamma-ray spectrometry was employed in the determination of the radionuclide contents in the products. The gamma-ray peaks observed with reliable regularity in all the samples analyzed belong to naturally occurring radionuclides, namely 238U, 232Th and 40K. Essentially radioactive elements such as 137Cs were not detected in any of the samples. The results obtained for 238U and 232Th show no particular pattern of variation in relation to the sampling locations. It is also evident that 40K makes the largest contribution to the radionuclide contents of these vegetables. This could be attributed to the use of fertilizers by the farmers. The average committed effective dose due to 238U and 232Th radionuclides from the consumption of African Spanich (green) is 0.24 µSvy-1. The average committed effective doses due to 238U and 232Th radionuclides from the consumption of Talinum triagulare (water leaf), Telfira occidentalis (Ugu), Vernonia amygdalina (Bitter leaf), Abelmoschus esculentum (Okro) and Corchorus capsularis (Arira/Ewedu) are 0.40 µSvy-1, 0.79 µSvy-1, 1.34 µSvy-1, 0.84 µSvy-1 and 0.43 µSvy-1 respectively.
Key Words: Radioactivity, Radionuclides, Committed Effective Dose, Contamination