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The present study aims to assess natural radioactivity in sediment cores collected from the Moulay Bousselham Lagoon. For this purpose, sediment cores were analyzed for radionuclides concentrations measurement by gamma spectrometry. At the same time, the radiometric dating approach was applied to establish the deposition history of radionuclides in the lagoon using Pb-210. In the three cores, Ra-226 levels show slight variations in the top layers and then deplete with depth. Similarly, for 232Th and 40K, the concentration activity decreases with depth, with a pronounced peak shown in the period extended between 1973 and 1980 in the three cores for the three studied radionuclides. This suggests a change in conditions controlling the accumulation of these naturally occurring radionuclides. The calculated radiation hazards index values were lower than the global average, signifying no radiological risk associated with the investigated radionuclides, and the lagoonal sediments do not present any serious hazard. This study is the first detailed database carried out in Moulay Bousselham on the assessment of the history of natural radionuclides deposition and concentrations, and it will be a reference for the activity of radionuclides in Moulay Bousselham lagoon sediment.

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Natural Radioactivity Concentrations Assessment of Sediment Cores of the Moulay Bousselham Coastal Lagoon, Morocco

  • 章节

  • 发表日期：

    2026年

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  • Nezha Mejjad,
  • Abdelmourhit Laissaoui,
  • Azzouz Benkdad

摘要

The present study aims to assess natural radioactivity in sediment cores collected from the Moulay Bousselham Lagoon. For this purpose, sediment cores were analyzed for radionuclides concentrations measurement by gamma spectrometry. At the same time, the radiometric dating approach was applied to establish the deposition history of radionuclides in the lagoon using Pb-210. In the three cores, Ra-226 levels show slight variations in the top layers and then deplete with depth. Similarly, for 232Th and 40K, the concentration activity decreases with depth, with a pronounced peak shown in the period extended between 1973 and 1980 in the three cores for the three studied radionuclides. This suggests a change in conditions controlling the accumulation of these naturally occurring radionuclides. The calculated radiation hazards index values were lower than the global average, signifying no radiological risk associated with the investigated radionuclides, and the lagoonal sediments do not present any serious hazard. This study is the first detailed database carried out in Moulay Bousselham on the assessment of the history of natural radionuclides deposition and concentrations, and it will be a reference for the activity of radionuclides in Moulay Bousselham lagoon sediment.