In the heart of Nigeria, a recent study has shed light on the radiological safety of the Nupe Basin, a fractured sedimentary zone, with implications that could ripple through the maritime and energy sectors. The research, led by Emmanuel Abiodun Oni of the Department of Pure and Applied Physics at Ladoke Akintola University of Technology, has been published in the journal Discover Geoscience, which translates to “Explore Earth Science” in English.
Oni and his team analyzed high-resolution aero-radiometric data to determine the concentrations of natural radionuclides—uranium-238, thorium-232, and potassium-40—and to evaluate radiological hazard indices. The goal was to assess the potential risks associated with exposure to these radionuclides in the Nupe Basin.
The findings revealed that the activity concentrations of these radionuclides varied significantly across the region, with uranium ranging from 3.7 to 1323.5 Bq/Kg, thorium from 3.7 to 1323.5 Bq/Kg, and potassium from 3.7 to 1323.5 Bq/Kg. The average values were 35.3 Bq/Kg for uranium, 48.88 Bq/Kg for thorium, and 179.9 Bq/Kg for potassium.
The radiological hazard indices were also calculated, showing an average absorbed dose rate of 53.38 nGy/h, an annual effective dose of 0.065 mSv/y, and an excess lifetime cancer risk of 1.85E-4. These values are well within the recommended safety thresholds of 84 nGy/h, 1 mSv/y, and 3.75E-3, respectively.
“This means that the area can be considered radiologically safe,” Oni stated. “The calculated Excess Lifetime Cancer Risk suggests a low probability of cancer development among residents in most parts of the study area.”
For the maritime and energy sectors, these findings are crucial. The Nupe Basin’s radiological safety could open up new opportunities for offshore drilling and exploration. Companies operating in the region can now do so with greater confidence, knowing that the radiological risks are minimal.
Moreover, the study’s methodology—using high-resolution aero-radiometric data and advanced software like Oasis Montaj—sets a precedent for future radiological assessments. This could lead to more efficient and accurate evaluations of other regions, benefiting both the environment and the industries operating within it.
As Oni put it, “Our research provides a solid foundation for future studies and practical applications in the field of radiological safety.”
In summary, the study not only assures the safety of the Nupe Basin but also paves the way for safer and more informed maritime and energy operations. The findings, published in Discover Geoscience, are a testament to the importance of thorough radiological assessments in ensuring the safety and sustainability of our natural resources.