Aruwa, A., A. A. Kassimu, P. M. Gyuk, B. Ahmadu, and J. O. Aniegbu. “STUDIES ON RADON CONCENTRATION IN UNDERGROUND WATER OF IDAH, NIGERIA”. International Journal of Research -GRANTHAALAYAH, vol. 5, no. 9, Sept. 2017, pp. 266-74, doi:10.29121/granthaalayah.v5.i9.2017.2242.