Natural radioactivity measurements and external dose estimation by car-borne survey in Douala city, CameroonS.D. Takoukam Soh, Saïdou, M. Hosoda, J.E. Ndjana Nkoulou II, N. Akata, O. Bouba and S. TokonamiRadioprotection, 53 4 (2018) 255-263DOI: https://doi.org/10.1051/radiopro/2018032