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<p>A monazite concentrate recovered from coastal placers in Lam Dong, Vietnam, was analyzed using XRD, SEM/EDS, optical microscopy, ICP-MS, and gamma spectrometry. The results indicate that the concentrate is highly enriched in light rare earth elements (46.1&#xa0;wt% of total REEs), with notable proportions of Nd₂O₃ (8.8&#xa0;wt%) and Pr₆O₁₁ (2.7&#xa0;wt%). In addition, substantial concentrations of Th (4.5 wt%) and U (0.35 wt%) contributed to elevated activity concentration (564.4&#xa0;Bq&#xa0;g<sup>−1</sup>), primarily associated with the <sup>232</sup>Th decay series. These findings highlight not only the REEs resource potential of Vietnamese monazite but also the critical importance of radiation safety during processing, transportation, and residue management.</p>

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Mineralogical, chemical, and radiometric characterization of monazite concentrates from Lam Dong, Vietnam: implications for rare earth recovery and radiation safety

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Thanh Thuy Nguyen,
  • Xuan Dinh Luu,
  • Trong Hung Nguyen

摘要

A monazite concentrate recovered from coastal placers in Lam Dong, Vietnam, was analyzed using XRD, SEM/EDS, optical microscopy, ICP-MS, and gamma spectrometry. The results indicate that the concentrate is highly enriched in light rare earth elements (46.1 wt% of total REEs), with notable proportions of Nd₂O₃ (8.8 wt%) and Pr₆O₁₁ (2.7 wt%). In addition, substantial concentrations of Th (4.5 wt%) and U (0.35 wt%) contributed to elevated activity concentration (564.4 Bq g−1), primarily associated with the 232Th decay series. These findings highlight not only the REEs resource potential of Vietnamese monazite but also the critical importance of radiation safety during processing, transportation, and residue management.