Bayrak, G., KeleÅŸ, E. and Atik, D. 2018. Estimation of Radioactivity Caused by Chemical Fertilizers on Trakya Sub-Region Soils and Its Potential Risk on Ecosystem. European Journal of Sustainable Development. 7, 3 (Oct. 2018), 413. DOI:https://doi.org/10.14207/ejsd.2018.v7n3p413.