E., Esien-Umo, et al. “X-RAY BARRIER ESTIMATION - A CASE STUDY OF THE GENERAL RADIOGRAPHY ROOM OF A MAJOR NIGERIAN TEACHING HOSPITAL”. Journal of Radiography and Radiation Sciences, vol. 27, no. 1, Jan. 2026, pp. 16-24, https://doi.org/10.82547/jrrs.vol27no1.112.