Chinyere Nwankpa, Alexander. “Determination of Food Crops Contamination in Osun State, Nigeria Due to Radium-226, Thorium-232 and Potassium-40 Concentrations in the Environment”. European Journal of Sustainable Development 6, no. 4 (October 1, 2017): 169. Accessed November 22, 2024. https://ojs.ecsdev.org/index.php/ejsd/article/view/558.