Estimation of Utilization Index and Excess Lifetime Cancer Risk in Soil Samples Using Gamma Ray Spectrometry in Ibolo-Oraifite, Anambra State, Nigeria

Ionizing radiations emanating from human natural environment could have serious negative effects at certain exposure level. Therefore the evaluation of radioisotopes origin becomes very important in order to achieve specific objective quantifying radiological parameters and their respective health implications. Hence estimation Activity Utlization Index (AUI) Excess Lifetime Cancer Risk (ELCR) has been done using gamma spectroscopy method. The results showed that mean activity concentrations 238U, 232Th, 40K which AUI ELCR were computed 22.19, 9.70 543.80 Bqkg-1 respectively. Utilization ranged 0.24 0.55 0.07 0.17 x 10-3. average value was 0.38 whereas found be 0.12×10-3 implied < 2, 0.29, standard permissible limits. Mean values Dose, Igamma, annual effective dose equivalent (AEDE), Hin, Hex gonadal (AGED) 38.95nGh-1, 0.61, 0.05, 0.27, 0.21 279.87µSvy-1 respectively. In conclusion, empirical utilization index good air quality. Also, excess lifetime cancer risks indicated low chances potential carcinogenicity effect for a ionizing radiation this environment.