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<p>This study assesses naturally occurring radioactive material in surface soils of the Oued Beht watershed (Morocco) and quantifies associated radiological hazards near a fluorite mine. Twelve composite topsoil samples from near-mine and background sites were analysed by gamma-ray spectrometry. Activity concentrations of <sup>40</sup>K, <sup>226</sup>Ra and <sup>232</sup>Th range from 74.98–2004, 6.20–23.83 and 15.48–136.50&#xa0;Bq&#xa0;kg<sup>−1</sup> (means: 1101.99, 15.64 and 69.81&#xa0;Bq&#xa0;kg<sup>−1</sup>). Derived indices, including radium equivalent activity (&lt; 370&#xa0;Bq&#xa0;kg<sup>−1</sup>) and outdoor annual effective dose (&lt; 1&#xa0;mSv&#xa0;yr<sup>−1</sup>), remain within guideline limits; only one site shows a marginal internal hazard index exceedance (1.022). Near-mine soils show localized 234&#xa0;mPa enrichment.</p>

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Natural radioactivity and radiological risk in soils of the Oued Beht watershed (Morocco): baseline assessment in a semi-arid catchment hosting a fluorite mine

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Nassima Moutaoikil,
  • Hamid Bounouira,
  • Mohamed Mastere,
  • Brahim Benzougagh,
  • Bouchta El Fellah,
  • Hamid Amsil,
  • Iliasse Aarab,
  • Abdelwahab Badague

摘要

This study assesses naturally occurring radioactive material in surface soils of the Oued Beht watershed (Morocco) and quantifies associated radiological hazards near a fluorite mine. Twelve composite topsoil samples from near-mine and background sites were analysed by gamma-ray spectrometry. Activity concentrations of 40K, 226Ra and 232Th range from 74.98–2004, 6.20–23.83 and 15.48–136.50 Bq kg−1 (means: 1101.99, 15.64 and 69.81 Bq kg−1). Derived indices, including radium equivalent activity (< 370 Bq kg−1) and outdoor annual effective dose (< 1 mSv yr−1), remain within guideline limits; only one site shows a marginal internal hazard index exceedance (1.022). Near-mine soils show localized 234 mPa enrichment.