Radioactivity level of drilled well water acrossselected cities in Ondo and Ekiti states, SouthwesternNigeria and its radiological implications

The increasing health effects of nuclear radiation occasioned byenhanced human activities in the environment necessitated the need forconstant evaluation and assessment of radiological impact on the generalpopulace within a confined developmental area. hence, ten (10) drilled wellwater samples were collected from various cities distributed across ondo andekiti states and analyzed for gamma-emitting radiations. materials andmethods: the collected water samples were analyzed using n-type co-axialhpge detector (canberra inc, usa), to determine the activity concentrationsof the gamma emitting radiations, which was used with dose conversionfactors to calculate the age dependent total annual effective dose equivalentsto six different age groups and the committed effective dose for the agegroup >17y. results: activity concentrations ranged from 2.25±0.39 to35.61±6.22 bq l-1232th, 7.08±1.71 to 56.68±12.50 bq l-1226ra, 45.42±2.98 to467.61±31.69 bq l-140k and 1.66±0.46 to 25.55±5.76 bq l-1232th, 4.90±1.08 to54.18±13.34 bq l-1226ra, 41.50±2.89 to 558.82±31.69 bq l-140k, respectivelyfor ondo and ekiti states . furthermore, the mean total annual effective doseequivalent for the age groups was found to be within the range of (2.81 ±0.46 – 26.91 ± 5.11) msv/y and (4.71 ± 0.92 – 23.58 ± 5.12) msv/y respectivelyfor ondo and ekiti states. conclusion: this is above the 1.0 msv y-1 and0.1msv y-1 respectively set by icrp and who. hence, the drilled wells arerecommended for water screening to remove radionuclides.