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<p>Instrumental neutron activation analysis using a californium-252 neutron source (<sup>252</sup>Cf INAA) was applied for multi-element analysis of Dictyonema Shales from the Baltic Paleobasin. The method enabled rapid, precise determination of V, Mo, Sc, several rare earth elements (REEs: La, Sm, Eu, Dy), Au, and U in 54 samples without complex preparation. Their concentrations exceeded the respective Clarke values by factors of 3 to 35., with uranium enrichment driving high natural radioactivity (Raₑq up to 1734&#xa0;Bq&#xa0;kg⁻<sup>1</sup>). A strong correlation (r = 0.95) between INAA-derived U and gamma-spectrometric <sup>226</sup>Ra confirmed analytical accuracy. Inter-element correlations (U–V–Mo–REEs) indicate co-enrichment and metallogenic potential.</p>

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Application of instrumental neutron activation analysis (INAA) with a californium neutron source for the determination of valuable metals in black shales of the Baltic Paleobasin

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Sergei Ivannikov,
  • Vladimir Ivanov,
  • Nikita Markin,
  • Larisa Zemskova,
  • Igor Okunev

摘要

Instrumental neutron activation analysis using a californium-252 neutron source (252Cf INAA) was applied for multi-element analysis of Dictyonema Shales from the Baltic Paleobasin. The method enabled rapid, precise determination of V, Mo, Sc, several rare earth elements (REEs: La, Sm, Eu, Dy), Au, and U in 54 samples without complex preparation. Their concentrations exceeded the respective Clarke values by factors of 3 to 35., with uranium enrichment driving high natural radioactivity (Raₑq up to 1734 Bq kg⁻1). A strong correlation (r = 0.95) between INAA-derived U and gamma-spectrometric 226Ra confirmed analytical accuracy. Inter-element correlations (U–V–Mo–REEs) indicate co-enrichment and metallogenic potential.