Research Article
Assessment of Radiation Exposure Rate and Excess Lifetime Cancer Risk in Oil-Producing Communities of Edo State, Nigeria
Issue:
Volume 14, Issue 5, October 2026
Pages:
108-116
Received:
25 November 2025
Accepted:
9 January 2026
Published:
20 September 2026
Abstract: The exposure of humans and other living matters in the environment to ionizing radiation is traceable to natural and artificial activities such as oil and gas exploration. This study presents the result of assessment of ionizing radiation exposure and excess lifetime cancer risk in oil producing communities of Edo state Nigeria. An In-situ measurement of radiation exposure rate was done using well calibrated radiation detector (Radalert-100). From the ionizing radiation exposure rate, the absorbed dose, annual effective dose and excess lifetime cancer risk were calculated by standard methods. Results showed that the outdoor mean absorbed dose rates due to the ionizing radiation exposure rate in the various communities of the four LGAs, estimated were 137.837 nGyh-1, 98.457 nGyh-1, 92.83 nGyh-1, 75.95 nGyh-1, 78.76 nGyh-1, 118.15 nGyh-1, 73.13 nGyh-1 and118.15 nGyh-1 respectively for Ohamaha, Ologbo, Obaretin, River A, River B, EDSPADEC, Gelegele Town, and Flow Station. The obtained values for absorbed dose rate and excess lifetime cancer risk (ELCR) in Ohamaha, Ologbo, Obaretin, EDSPADEC and Flow station, are higher than the world average value of 89 nGyh-1 (UNSCEAR, 2000) 0.29 × 10- 3 respectively. The study concluded that the chance of the workers and those living around such locations to be exposed to cancer overtime in these communities is high due to the high value of ionizing radiation exposure rate and high values of excess lifetime cancer risk obtained in this study which is attributed to oil exploration activities within the study area. Hence, the implication is that there are possibilities of stochastic effects on the exposed individuals.
Abstract: The exposure of humans and other living matters in the environment to ionizing radiation is traceable to natural and artificial activities such as oil and gas exploration. This study presents the result of assessment of ionizing radiation exposure and excess lifetime cancer risk in oil producing communities of Edo state Nigeria. An In-situ measurem...
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Research Article
Comparative Analysis of the Hydrocarbon Composition and Technological Characteristics of Gas from Fields in the Ustyurt Region
Makhbuba Abdullayevna Mirsagatova
,
Munira Rustambekovna Sodikova*
Issue:
Volume 14, Issue 5, October 2026
Pages:
117-126
Received:
18 August 2026
Accepted:
11 September 2026
Published:
20 October 2026
DOI:
10.11648/j.ogce.20261405.12
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Abstract: Previous studies of natural gas from the Ustyurt region have focused mainly on geological characteristics or individual quality parameters, whereas integrated assessments linking hydrocarbon composition, energy performance, impurity concentrations, and flow-rate-based treatment loads at individual gas gathering stations (GGSs) remain limited. This study addressed this gap by comparing 15 sets of production and analytical data from GGSs at fields in the Ustyurt region. Seven gas streams were examined in detail using direct comparison, range analysis, and calculations of daily mercury and volumetric hydrogen sulfide loads. The principal contribution of the study is the combined assessment of gas composition, energy properties, and impurity loads under field operating conditions. Increasing C2+ hydrocarbon content was associated with higher gas density, molar mass, higher heating value, and Wobbe index. For the seven selected sites, linear relationships were obtained between C2+ content and both higher heating value (R2 = 0.9938) and Wobbe index (R2 = 0.9893). The gas with the highest methane content did not exhibit the highest energy value because of its low CS2+ content and comparatively high carbon dioxide concentration. The stream with the highest mercury concentration was not the stream with the greatest daily mercury load, demonstrating that impurity concentration must be evaluated together with gas flow rate. The results provide a basis for GGS-specific decisions on mercury and hydrogen sulfide removal, hydrocarbon dew-point control, stream blending, and feed preparation before transportation and downstream gas processing.
Abstract: Previous studies of natural gas from the Ustyurt region have focused mainly on geological characteristics or individual quality parameters, whereas integrated assessments linking hydrocarbon composition, energy performance, impurity concentrations, and flow-rate-based treatment loads at individual gas gathering stations (GGSs) remain limited. This ...
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