Tokyo Metropolitan University, 7-2-10 Higashiogu, Arakawa-ku, Tokyo, 116-8551, Japan; National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
Chemosphere. 2023 May;323:138217. doi: 10.1016/j.chemosphere.2023.138217. Epub 2023 Feb 25.
The Chhatrapur-Gopalpur coastal area in Odisha, India is a well-known natural high background radiation (HBRA) area due to the abundance of monazite (a thorium bearing radioactive mineral) in beach sands and soils. Recent studies on Chhatrapur-Gopalpur HBRA groundwater have reported high concentrations of uranium and its decay products. Therefore, the soils of the Chhatrapur-Gopalpur HBRA are reasonably suspected as the sources of these high uranium concentrations in groundwater. In this report, first the uranium concentrations in soil samples were measured using inductively coupled plasma mass spectrometry (ICP-MS) and they were found to range from 0.61 ± 0.01 to 38.59 ± 0.16 mg kg. Next, the U/U and U/U isotope ratios were measured to establish a baseline for the first time in Chhatrapur-Gopalpur HBRA soil. Multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) was used for measurement of these isotope ratios. The U/U ratio was observed to be the normal terrestrial value. The U/U activity ratio, was calculated to understand the secular equilibrium between U and U in soil and it varied from 0.959 to 1.070. To understand the dynamics of uranium in HBRA soil, physico-chemical characteristics of soil were correlated with uranium isotope ratios and this correlation of U/U activity ratio indicated the leaching of U from Odisha HBRA soil.
印度奥里萨邦的恰特拉普尔-戈帕尔布尔沿海地区是一个著名的天然高本底辐射（HBRA）地区，这是由于海滩砂和土壤中富含独居石（一种含钍的放射性矿物）。最近对恰特拉普尔-戈帕尔布尔 HBRA 地下水的研究报告称，铀及其衰变产物的浓度很高。因此，恰特拉普尔-戈帕尔布尔 HBRA 的土壤很可能是这些高铀浓度地下水的来源。在本报告中，首先使用电感耦合等离子体质谱（ICP-MS）测量了土壤样品中的铀浓度，结果发现范围在 0.61±0.01 至 38.59±0.16 mg kg 之间。接下来，测量了 U/U 和 U/U 同位素比值，首次在恰特拉普尔-戈帕尔布尔 HBRA 土壤中建立了基线。使用多接收电感耦合等离子体质谱（MC-ICP-MS）进行这些同位素比值的测量。U/U 比值为正常的地球值。U/U 活度比的计算是为了了解土壤中 U 和 U 之间的 secular 平衡，其范围为 0.959 至 1.070。为了了解 HBRA 土壤中铀的动态，对土壤的物理化学特性与铀同位素比值进行了相关分析，U/U 活度比的这种相关性表明了奥里萨邦 HBRA 土壤中铀的淋滤。
