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<p>In the present study eighteen soil samples were collected from the hydro-uranium anomalous zones of South Purulia Shear Zone (SPSZ) to assess the natural radioactivity in soil in terms of radium (<sup>226</sup>Ra), thorium (<sup>232</sup>Th) and potassium (<sup>40</sup>K), while thirty groundwater samples were analysed for dissolved radon activity. Measurements reveal that several soil samples correspond to much higher activity than global population-weighted average concentrations of <sup>226</sup>Ra, <sup>232</sup>Th and <sup>40</sup>K, resulting in elevated hazard indices linked to uranium-thorium rich lithology of SPSZ. Groundwater exhibits significant spatial variability in dissolved <sup>222</sup>Rn, with several locations exhibiting ingestion doses exceeding recommended reference dose levels. Estimated excess lifetime cancer risk (<i>ELCR</i>) and lung cancer cases (<i>LCC</i>) suggest localized long-term health implications linked to fracture-controlled radon transport pathways.</p>

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Radioactivity profiling and radiological risk assessment in the hydro-uranium anomalous zone of the South Purulia Shear Zone, India

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Sayantan Mitra,
  • Sumana Mukherjee,
  • Joydeep Mukherjee,
  • Sushanta Sutradhar,
  • Soumalya Kundu,
  • Anil Sharma,
  • Aditi Das,
  • Pankaj K. Giri,
  • Rajarshi Raut,
  • Sandeep S. Ghugre,
  • Chiranjib Barman

摘要

In the present study eighteen soil samples were collected from the hydro-uranium anomalous zones of South Purulia Shear Zone (SPSZ) to assess the natural radioactivity in soil in terms of radium (226Ra), thorium (232Th) and potassium (40K), while thirty groundwater samples were analysed for dissolved radon activity. Measurements reveal that several soil samples correspond to much higher activity than global population-weighted average concentrations of 226Ra, 232Th and 40K, resulting in elevated hazard indices linked to uranium-thorium rich lithology of SPSZ. Groundwater exhibits significant spatial variability in dissolved 222Rn, with several locations exhibiting ingestion doses exceeding recommended reference dose levels. Estimated excess lifetime cancer risk (ELCR) and lung cancer cases (LCC) suggest localized long-term health implications linked to fracture-controlled radon transport pathways.