A detailed gamma-ray spectrometry survey in Ibolo-Oraifite, Anambra State, Nigeria detected measurable levels of naturally occurring radionuclides and confirmed that there is no immediate health risk.

Spearheaded by Mr. Ikenna Odezuligbo (Federal University Otuoke, Nigeria; Creighton University, U.S.A), the investigation quantified concentrations of uranium-238, thorium-232 and potassium-40 to calculate two critical metrics: the Activity Utilization Index (a direct measure of the soil’s radiological hazard) and Excess Lifetime Cancer Risk (the probability of developing cancer over a lifetime due to that hazard).
The findings, published in the American Journal of Environmental Science and Engineering, signify a major advancement in comprehending environmental radioactivity in the region.

“It is imperative that we understand the baseline levels of radioactivity in our environment to safeguard public health,” Mr. Odezuligbo stated. “Our study in Ibolo-Oraifite offers critical data for assessing potential risks associated with exposure to naturally occurring radioactive materials in the soil.”

Using non-destructive gamma-ray spectrometry, Odezuligbo’s team collected 20 composite soil samples from eight villages across Ibolo-Oraifite. Each sample underwent spectral analysis to isolate the gamma emissions specific to uranium-238, thorium-232 and potassium-40. From these activity concentrations, the researchers applied standard radiological models to derive AUI and ELCR.

“Gamma-ray spectrometry lets us identify and quantify each radionuclide without altering the sample,” Mr. Odezuligbo explained. “That precision underpins the reliability of our hazard indices.”

By benchmarking these indices against international standards, the study delivered actionable conclusions:
Confirm no immediate health risk: AUI < 0.55 (threshold 2) and ELCR < 0.17 × 10⁻³ (threshold 0.29 × 10⁻³).
Recommend targeted follow-up: Elevated potassium-40 levels suggest focused soil testing in hot-spot areas.
Advise crop selection: Guidance on crop selection could minimise potassium uptake into the food chain.

“Even when indices are below danger levels, understanding spatial variation is key,” Mr. Odezuligbo noted.

“This approach can be replicated elsewhere to build a national radiological map.”

Building on prior surveys of beach sands and dumpsites, this community-level assessment fills a critical gap in Nigeria’s environmental-radiation profile. The paper’s methodology and metrics provide a template for future studies in other regions, and for ongoing monitoring as land use and climate factors evolve.

“Our framework is scalable,” Mr. Odezuligbo suggested. “When regulators adopt a standardized spectrometry protocol, they can compare results across states and years, ensuring consistent public-health safeguards.”

With the national agencies prioritizing environmental health, Mr. Odezuligbo’s rigorous baseline study equips Nigeria’s decision-makers with the data they need to confront real and perceived radiation risks safely, systematically, and scientifically.

With hard data now in hand, local leaders and national agencies alike can move from study to action, mapping hotspot zones, guiding safe farming practices, and rolling out routine monitoring—so that Ibolo-Oraifite’s soils remain not just tested, but truly safe for generations to come.