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<p>For the permanent disposal of radioactive waste in Korea, it is essential to provide an accurate accounting of radionuclide inventories. Efficient and reliable sample pre-treatment is critical for accurate analysis, particularly as large quantities of contaminated soils are generated during nuclear decommissioning and site remediation. In this study, we developed and optimized a pre-treatment process for contaminated soils based on Ultrasonic-assisted Acid Leaching (UAL) using standard reference soil material (NIST SRM 2711a). Variables such as acid type and concentration, Solid/Liquid ratio (S/L ratio), and irradiation time were systematically optimized. Our results demonstrate that conventional acid leaching methods are limited in removing radionuclides strongly adsorbed to soil; in contrast, the UAL process developed here achieved remarkably high removal efficiency (mean chemical recovery &gt; 90% within 1h) for most targeted nuclides. The practical applicability of UAL was validated through comparative tests using real soil-type radioactive waste from the Korea Atomic Energy Research Institute (KAERI), confirming the superior performance and field viability of this approach over traditional methods.</p>

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Ultrasonic-assisted acid leaching for efficient pre-treatment of contaminated soil containing multiple radionuclides

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Jung Bo Yoo,
  • Yu Jin Lee,
  • Ji-Eun Lee,
  • Hyeonjune Noh,
  • Ki Joon Kang,
  • Jung-Weon Choi,
  • Kyunghun Jung,
  • Jai il Park

摘要

For the permanent disposal of radioactive waste in Korea, it is essential to provide an accurate accounting of radionuclide inventories. Efficient and reliable sample pre-treatment is critical for accurate analysis, particularly as large quantities of contaminated soils are generated during nuclear decommissioning and site remediation. In this study, we developed and optimized a pre-treatment process for contaminated soils based on Ultrasonic-assisted Acid Leaching (UAL) using standard reference soil material (NIST SRM 2711a). Variables such as acid type and concentration, Solid/Liquid ratio (S/L ratio), and irradiation time were systematically optimized. Our results demonstrate that conventional acid leaching methods are limited in removing radionuclides strongly adsorbed to soil; in contrast, the UAL process developed here achieved remarkably high removal efficiency (mean chemical recovery > 90% within 1h) for most targeted nuclides. The practical applicability of UAL was validated through comparative tests using real soil-type radioactive waste from the Korea Atomic Energy Research Institute (KAERI), confirming the superior performance and field viability of this approach over traditional methods.