A. Isola, Gbadebo, et al. “Assessment and Comparative Study of Radon Level in Water Samples Collected Within Ogbomoso Metropolis, Oyo State, Nigeria”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 57, no. 1, Mar. 2021, pp. 16-22, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/12368.