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<p>Natural radioactivity is the major source of human exposure to ionizing radiation, whose level of exposure primarily depends on geographical and geological features of the region. Taraba State is endowed with abundant uranium deposits, which emit gamma rays into the environment. Gamma ray is carcinogenic, and its relation to excess cancer risks in the state is yet to be ascertained. Terrestrial gamma radiation dose (TGRD) rates in Taraba State were assessed with respect to geological formations of the state, using a handheld gamma surveyor. The measured TGRD rates in the studied area ranged from <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_22939_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="122" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:2\:\text{t}\text{o}\:8467\:\text{n}\text{G}\text{y}{h}^{-1}\)</EquationSource> </InlineEquation> with an average value of <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_22939_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="129" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:108\:\pm\:13\:\text{n}\text{G}\text{y}{h}^{-1}\)</EquationSource> </InlineEquation>. The average annual outdoor effective dose rates and excess lifetime cancer risk in the state were <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_22939_Article_IEq3.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="150" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:0.13\:\pm\:0.02\:mSv{y}^{-1}\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_22939_Article_IEq4.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="127" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:0.46\:\pm\:0.06\:mSv\)</EquationSource> </InlineEquation> respectively, which are higher than the world average values of <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_22939_Article_IEq5.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="93" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:0.07\:mSv{y}^{-1}\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_22939_Article_IEq6.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="93" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:0.29\:\times\:\:{10}^{-3}\)</EquationSource> </InlineEquation> respectively. The isodose map revealed that Yorro, Zing, Lau, Jalingo, Wukari, Donga, and Saraduna local government areas of the state are the places affected by elevated TGRD rates above the world average value. This means that inhabitants within the above-mentioned locations are at higher risk of excess cancer and other radiation-related illnesses in their lifetime in the state, assuming they spent their lifetime in the state.</p>

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Assessment of terrestrial gamma radiation dose rates and its associated hazards in Taraba State, Nigeria

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  • 发表日期：

    2025年11月11日

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  • C. M. Odoh,
  • N. N. Garba,
  • R. Nasiru,
  • M. Isma’il

摘要

Natural radioactivity is the major source of human exposure to ionizing radiation, whose level of exposure primarily depends on geographical and geological features of the region. Taraba State is endowed with abundant uranium deposits, which emit gamma rays into the environment. Gamma ray is carcinogenic, and its relation to excess cancer risks in the state is yet to be ascertained. Terrestrial gamma radiation dose (TGRD) rates in Taraba State were assessed with respect to geological formations of the state, using a handheld gamma surveyor. The measured TGRD rates in the studied area ranged from \(\:2\:\text{t}\text{o}\:8467\:\text{n}\text{G}\text{y}{h}^{-1}\) with an average value of \(\:108\:\pm\:13\:\text{n}\text{G}\text{y}{h}^{-1}\) . The average annual outdoor effective dose rates and excess lifetime cancer risk in the state were \(\:0.13\:\pm\:0.02\:mSv{y}^{-1}\) and \(\:0.46\:\pm\:0.06\:mSv\) respectively, which are higher than the world average values of \(\:0.07\:mSv{y}^{-1}\) and \(\:0.29\:\times\:\:{10}^{-3}\) respectively. The isodose map revealed that Yorro, Zing, Lau, Jalingo, Wukari, Donga, and Saraduna local government areas of the state are the places affected by elevated TGRD rates above the world average value. This means that inhabitants within the above-mentioned locations are at higher risk of excess cancer and other radiation-related illnesses in their lifetime in the state, assuming they spent their lifetime in the state.