1. Centre of Excellence in Carbon-based Fuels, School of Chemical and Minerals Engineering, North West-University, Potchefstroom, South Africa
2. Centre of Excellence in Carbon-based Fuels, School of Physical and Chemical Sciences, North-West University, Potchefstroom, South Africa
3. CIMERA Department of Geology, University of Johannesburg, Johannesburg, South Africa
4. Radiation Science Department, The South African Nuclear Energy Corporation SOC Ltd (SOC), Pelindaba, South Africa