IN-SITU RADIOMETRIC SURVEY OF DUMPSITES AT OKITIPUPA MAIN MARKET, ONDO STATE, NIGERIA

Abstract

This study assessed radiological risks from gamma radiation exposure at three active dumpsites in Okitipupa Main Market, Ondo State, Nigeria. Using an in-situ method with a calibrated handheld detector and GPS mapping, ambient dose rates were measured to estimate activity concentrations and radiological hazard indices such as Annual Effective Dose Equivalent (AEDE) and Excess Lifetime Cancer Risk (ELCR). Results showed site-specific variations: Dumpsite A had the highest mean dose rate (0.192 µSv/h) and activity concentration (0.768 Bq/m³), followed by Dumpsite B (0.172 µSv/h, 0.689 Bq/m³), while Dumpsite C recorded the lowest values (0.159 µSv/h, 0.635 Bq/m³). All AEDE and ELCR values remained below international safety limits. Although the results show that radiation levels are within permissible limits, ongoing observation is required because of possible alterations brought on by trash buildup or illegal dumping. The study underscores the importance of continuous radiological monitoring and recommends implementing stricter waste management policies and public health safeguards to prevent future radiation risks linked to unregulated dumping and evolving waste composition