Aljamil, R.O., Yousuf, R.M. and Hamdoon, N.A. 2022. Estimation of radon-gas, uranium-238 concentrations in the surface soil samples and alpha risk index at many Northern Iraqi Refineries. International journal of health sciences. 6, S9 (Sep. 2022), 2890–2905. DOI:https://doi.org/10.53730/ijhs.v6nS9.13154.