Application of Nuclear Radiation Detection Techniques in Environmental Monitoring of Oil Spill Sites in Rivers State

Environmental monitoring of petroleum hydrocarbon contamination in oil-producing communities requires robust, field-deployable detection methodologies that can complement conventional chemical analysis. This study applies nuclear radiation detection techniques to assess the distribution and intensity of naturally occurring radioactive material co-produced with crude oil at three documented spill sites in Rivers State, South South Nigeria. Portable gamma-ray survey meters and sodium iodide scintillation probes were deployed at each site to map radiation dose rate anomalies associated with radium-226 and lead-210 scale deposits commonly precipitated during oil production. Measurements were taken at grid intervals of 5 meters across each site and extended to clean reference areas for baseline subtraction. Radiological maps generated from field data were overlaid on satellite imagery to correlate contamination hotspots with surface hydrocarbon indicators. Results indicate gamma dose rate enhancements of up to six times background in areas of known scale deposit accumulation near wellheads. Correlation analysis between measured dose rates and independently determined total petroleum hydrocarbon concentrations in co-located soil samples shows a Pearson coefficient of 0.79, suggesting radiation detection can serve as a rapid screening proxy for petroleum contamination. The study evaluates the operational efficiency, detection limits, and cost-effectiveness of radiation-based screening relative to conventional gas chromatography methods. Professional recommendations are provided for integrating portable radiation detection into standard post-spill environmental assessment workflows for the Niger Delta. Keywords: radiation detection, oil spill, naturally occurring radioactivity, Rivers State, environmental monitoring