Tobi , A.C., Mokobia, C., Ikubor, .J.E., Omojola , A.D. and Akpolile , A. 2022. Estimation of effective dose for contrast and non-contrast head computed tomography using dose length product and k conversion coefficient for adult patients in SouthSouth Nigeria. NIGERIAN JOURNAL OF SCIENCE AND ENVIRONMENT. 18, 2 (Jun. 2022).