<p> The concentrations and distribution of naturally occurring radionuclides <span><span><span><span>(</span><sup><span>238</span></sup><span>U, </s...<p> The concentrations and distribution of naturally occurring radionuclides <span><span><span><span>(</span><sup><span>238</span></sup><span>U, </span><sup><span>235</span></sup><span>U, </span><sup><span>234</span></sup><span>U, </span><sup><span>230</span></sup><span>Th, </span><sup><span>226</span></sup><span>Ra, </span><sup><span>210</span></sup><span>Pb, </span><sup><span>232</span></sup><span>Th, </span><sup><span>228</span></sup><span>Ra, and </span><sup><span>40</span></sup><span>K)</span></span></span></span><span><span><span><span> were determined by alpha and gamma spectrometry in soil and sediments collected from Luilu and Dilala rivers located in the mining district of Kolwezi (Lualaba Province) of the Democratic Republic of the Congo. The average concentrations of </span><sup><span>238</span></sup><span>U and </span><sup><span>226</span></sup><span>Ra in the analyzed samples were 5</span></span></span></span><span><span><span> </span></span></span><span><span><span>-</span></span></span><span><span><span> </span></span></span><span><span><span>10 times higher than the world average values for soil provided by the </span></span></span><span><span><span>United Nations Scientific Committee on the Effects of Atomic Radiation. However,</span></span></span><span><span><span><span> the average concentrations of </span><sup><span>232</span></sup><span>Th were found similar to the world average. In both river basins, artisanal mining activities and</span></span></span></span><span><span><span> mineral washing sites displayed the higher concentration values of radionuclides. The mean values of health risk indices calculated for those sites were found sig</span></span></span><span><span><span>nificantly higher compared to world average levels. Radiation protection measures seem needed to ensure the radiation safety of local populations.</span></span></span> </p> <p> <span><span><span><br /> </span></span></span> </p> <p> <span style="font-size:16px;"><strong>Graphical Abstract</strong></span> </p> <p> <span><span><span><img src="Edit_7a1bf87c-f0a0-4c34-80b2-7e488ac5e4a2.png" alt="" /><br /> </span></span></span> </p>展开更多
文摘<p> The concentrations and distribution of naturally occurring radionuclides <span><span><span><span>(</span><sup><span>238</span></sup><span>U, </span><sup><span>235</span></sup><span>U, </span><sup><span>234</span></sup><span>U, </span><sup><span>230</span></sup><span>Th, </span><sup><span>226</span></sup><span>Ra, </span><sup><span>210</span></sup><span>Pb, </span><sup><span>232</span></sup><span>Th, </span><sup><span>228</span></sup><span>Ra, and </span><sup><span>40</span></sup><span>K)</span></span></span></span><span><span><span><span> were determined by alpha and gamma spectrometry in soil and sediments collected from Luilu and Dilala rivers located in the mining district of Kolwezi (Lualaba Province) of the Democratic Republic of the Congo. The average concentrations of </span><sup><span>238</span></sup><span>U and </span><sup><span>226</span></sup><span>Ra in the analyzed samples were 5</span></span></span></span><span><span><span> </span></span></span><span><span><span>-</span></span></span><span><span><span> </span></span></span><span><span><span>10 times higher than the world average values for soil provided by the </span></span></span><span><span><span>United Nations Scientific Committee on the Effects of Atomic Radiation. However,</span></span></span><span><span><span><span> the average concentrations of </span><sup><span>232</span></sup><span>Th were found similar to the world average. In both river basins, artisanal mining activities and</span></span></span></span><span><span><span> mineral washing sites displayed the higher concentration values of radionuclides. The mean values of health risk indices calculated for those sites were found sig</span></span></span><span><span><span>nificantly higher compared to world average levels. Radiation protection measures seem needed to ensure the radiation safety of local populations.</span></span></span> </p> <p> <span><span><span><br /> </span></span></span> </p> <p> <span style="font-size:16px;"><strong>Graphical Abstract</strong></span> </p> <p> <span><span><span><img src="Edit_7a1bf87c-f0a0-4c34-80b2-7e488ac5e4a2.png" alt="" /><br /> </span></span></span> </p>
