Ayeni, D. A. ., and F. M. . Adebiyi. “Evaluation of Natural Radioactivity and Radiation Hazards of Soils Around Petroleum Products Marketing Company Using Gamma Ray Spectrometry”. Tanzania Journal of Science, vol. 48, no. 2, June 2022, pp. 304-12, doi:10.4314/tjs.v48i2.7.