Determination of Radiological Health Hazard Indices in Selected Crude Oil Spilled Environment in Rivers State, Nigeria

摘要

The determination of radiological health hazard indices in some selected crude oil spilled sites in Rivers state, Nigeria has been carried out using Nal (TI) γ spectroscopy followed by mathematical computations. The analysis of percentage contributions of ~(226)Ra, ~(232)Th, and ~(40)K to the health risks of radium equivalent revealed that ~(226)Ra has the highest percentage contributions in four out of the five oil spilled sites, and was low at Mgbede. Health hazard indices of radium equivalent, excess lifetime cancer risk, and annual gonadal equivalent dose ranged from 87.05±3.93 Bqkg~(-1) to 201.12±9.06 Bqkg~(-1), 0.21×10~(-3) to 0.39×10~(-3), 245.67 mSvyr~(-1) to 621.42 mSvyr~(-1) respectively. I-gamma index ranged from 0.57 to 1.40 Bqkg~(-1). The external and internal hazard indices ranged from 0.22 to 0.54, and 0.26 to 0.82 respectively. The average absorbed doses ranged from 50.54 to 73.94 nGyh~(-1). The results are above the control samples obtained from similar environment. This showed that the soil, water and the environment have some levels of anthropological radiological degradation. Therefore the crude oil spilled areas should be minimally used especially by farmers and herdsmen to avoid intake of radioisotopes.