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<p>A year-long study in the seismically active Kopili Fault Zone was carried out to measure indoor <sup>222</sup>Rn and <sup>220</sup>Rn levels using LR-115 (II) detectors. The highest concentrations occurred in winter due to inadequate ventilation. RCC houses had the highest levels, followed by Assam-type and mud houses. The annual averages ranged from 23.0 to 198.0&#xa0;Bq&#xa0;m<sup>−3</sup> (<sup>222</sup>Rn) and 33.3 to 219.7&#xa0;Bq&#xa0;m<sup>−3</sup> (<sup>220</sup>Rn), with some RCC houses exceeding the ICRP limit during winter. These elevated levels could be attributed to the region’s frequent tectonic activity. The total annual effective dose (0.8–4.0&#xa0;mSv) remains within safe limits, though long-term exposure risks emphasize the need for mitigation measures.</p>

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Seasonal variations in indoor radon (222Rn) and thoron (220Rn) levels, and radiation risks in the seismically active Kopili Fault Zone, India

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Pranjal Protim Gogoi,
  • Sarat Phukan,
  • Debajyoti Barooah

摘要

A year-long study in the seismically active Kopili Fault Zone was carried out to measure indoor 222Rn and 220Rn levels using LR-115 (II) detectors. The highest concentrations occurred in winter due to inadequate ventilation. RCC houses had the highest levels, followed by Assam-type and mud houses. The annual averages ranged from 23.0 to 198.0 Bq m−3 (222Rn) and 33.3 to 219.7 Bq m−3 (220Rn), with some RCC houses exceeding the ICRP limit during winter. These elevated levels could be attributed to the region’s frequent tectonic activity. The total annual effective dose (0.8–4.0 mSv) remains within safe limits, though long-term exposure risks emphasize the need for mitigation measures.