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<p>This study presents an airborne radiometric assessment of natural gamma radiation across selected areas in Ondo and Osun States, Nigeria, utilising GIS gridded airborne geological map data from Sheets 263 and 264 obtained from the Nigerian Geological Survey Agency. The data, organised in a gridded format, were analysed using Oasis Montaj software to quantify the concentrations of naturally occurring radioelements, <sup>238</sup>U, <sup>232</sup>Th, and <sup>40</sup>K, and to estimate the corresponding terrestrial gamma dose rates. Results indicate that, in Sheet 264, concentrations of <sup>238</sup>U, <sup>232</sup>Th, and <sup>40</sup>K range from 4.7 to Bq/kg, 20.6 to 172.7&#xa0;Bq/kg, and 96.6 to 1560.50&#xa0;Bq/kg, with mean values of 48.2, 81.3, and 609.0 (Bq/kg) respectively. For Sheet 263, <sup>238</sup>U concentrations span 0.1–94.0&#xa0;Bq/kg, <sup>232</sup>Th from 5.90 to 162.70&#xa0;Bq/kg, and <sup>40</sup>K from 59.50 to 943.00&#xa0;Bq/kg with the average values of 37.2, 56.9, and 331.70 (Bq/kg) accordingly. The calculated absorbed dose rates in both sheets spanned between 37.8 and 191.6 and 14.3 and 161.8 for Sheet 264 and Sheet 263 with mean values of 100.5 nGy/h and 67.8 nGy/h. The absorbed dose rate for most of the locations in the study area exceeds the global average of 59 nGy/h, with generally higher values observed in Sheet 264. The high values of standard deviation and coefficient of variation, particularly for <sup>40</sup>K, indicate strong spatial heterogeneity in radioelement distribution, suggesting varying lithological and mineralogical compositions within the study area. The elevated levels of primordial radioelements and associated radiation doses in several locations suggest a potential public health concern due to chronic exposure to ionising radiation. Given the geological context and ongoing anthropogenic activities in the region, routine environmental monitoring is recommended to mitigate potential radiological risks to local populations.</p>

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Geospatial assessment of background radiation due to 238U, 232Th, and 40K, in selected locations in Ondo and Osun States using aeroradiometric technique

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Morakinyo Ruth O.,
  • Usikalu Mojisola R.,
  • Adagunodo Theophilus A.,
  • Ojo Olufemi F.,
  • Orosun Muyiwa M.

摘要

This study presents an airborne radiometric assessment of natural gamma radiation across selected areas in Ondo and Osun States, Nigeria, utilising GIS gridded airborne geological map data from Sheets 263 and 264 obtained from the Nigerian Geological Survey Agency. The data, organised in a gridded format, were analysed using Oasis Montaj software to quantify the concentrations of naturally occurring radioelements, 238U, 232Th, and 40K, and to estimate the corresponding terrestrial gamma dose rates. Results indicate that, in Sheet 264, concentrations of 238U, 232Th, and 40K range from 4.7 to Bq/kg, 20.6 to 172.7 Bq/kg, and 96.6 to 1560.50 Bq/kg, with mean values of 48.2, 81.3, and 609.0 (Bq/kg) respectively. For Sheet 263, 238U concentrations span 0.1–94.0 Bq/kg, 232Th from 5.90 to 162.70 Bq/kg, and 40K from 59.50 to 943.00 Bq/kg with the average values of 37.2, 56.9, and 331.70 (Bq/kg) accordingly. The calculated absorbed dose rates in both sheets spanned between 37.8 and 191.6 and 14.3 and 161.8 for Sheet 264 and Sheet 263 with mean values of 100.5 nGy/h and 67.8 nGy/h. The absorbed dose rate for most of the locations in the study area exceeds the global average of 59 nGy/h, with generally higher values observed in Sheet 264. The high values of standard deviation and coefficient of variation, particularly for 40K, indicate strong spatial heterogeneity in radioelement distribution, suggesting varying lithological and mineralogical compositions within the study area. The elevated levels of primordial radioelements and associated radiation doses in several locations suggest a potential public health concern due to chronic exposure to ionising radiation. Given the geological context and ongoing anthropogenic activities in the region, routine environmental monitoring is recommended to mitigate potential radiological risks to local populations.