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<p>This present study investigates the levels of dose rates and the potential risks of exposure to terrestrial gamma radiations in both indoors and outdoors in houses in the vicinity of the Dilli-Jeypore coalfield of Assam, India. The measurements were carried out using a highly sensitive portable Micro-R Survey Meter (UR 705). Indoor gamma dose rates have been estimated to be in the range of 49.7 ± 5.1–154.9 ± 5.1 nGy h<sup>−1</sup>, while outdoor rates varied between 49.7 ± 5.1 and 93.5 ± 5.1 nGy h<sup>−1</sup>, with an indoor to outdoor dose rate ratio of 1.21. The geometric mean of annual effective dose equivalent (AEDE) was calculated to be 0.49 ± 0.03 mSv y<sup>−1</sup>, which is slightly higher than the global recommended level of 0.48 mSv y<sup>−1</sup>. The excess lifetime cancer risk (ELCR) was estimated to range from 1.1 × 10<sup>–3</sup> to 2.9 × 10<sup>–3</sup>, with a mean of 1.72 × 10<sup>–3</sup>.</p>

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Investigation into terrestrial gamma radiations and radiological safety concerns near the Dilli-Jeypore coalfield, India

  • 期刊论文

  • 发表日期：

    2025年4月8日

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

摘要

This present study investigates the levels of dose rates and the potential risks of exposure to terrestrial gamma radiations in both indoors and outdoors in houses in the vicinity of the Dilli-Jeypore coalfield of Assam, India. The measurements were carried out using a highly sensitive portable Micro-R Survey Meter (UR 705). Indoor gamma dose rates have been estimated to be in the range of 49.7 ± 5.1–154.9 ± 5.1 nGy h−1, while outdoor rates varied between 49.7 ± 5.1 and 93.5 ± 5.1 nGy h−1, with an indoor to outdoor dose rate ratio of 1.21. The geometric mean of annual effective dose equivalent (AEDE) was calculated to be 0.49 ± 0.03 mSv y−1, which is slightly higher than the global recommended level of 0.48 mSv y−1. The excess lifetime cancer risk (ELCR) was estimated to range from 1.1 × 10–3 to 2.9 × 10–3, with a mean of 1.72 × 10–3.