Scholarlink

<p>The study evaluates natural radioactivity (<sup>23</sup>⁸U, <sup>232</sup>Th, <sup>4</sup>⁰K) and evaluated radiological risks in mylonite from a geologically complex area. The elevated average activity concentrations in the thirty samples that were analyzed through high pure germanium (HPGe) Gamma -Spectrometry (<sup>238</sup>U: 895 ± 252 Bq kg<sup>−1</sup>; <sup>232</sup>Th: 881 ± 275 Bq kg<sup>−1</sup>; <sup>40</sup>K: 990 ± 437 Bq kg<sup>−1</sup>). Mean values of radiological indices such as radium equivalent activity (Raeq: 2231 Bq kg⁻<sup>1</sup>), absorbed dose rate (D<sub>air</sub>: 986 nGy h⁻<sup>1</sup>), external and internal annual effective dose (AED<sub>out</sub>: 1.21 mSv; AED<sub>in</sub>: 4.84 mSv), and excess lifetime cancer risk (ELCR: 4.23 × 10<sup>–3</sup>)—surpass safety limits, indicates significant health risks. Statistical analysis emphasizes <sup>232</sup>Th is associated with enrichment under metamorphism. The high-values of activity concentrations of <sup>238</sup>U and <sup>232</sup>Th are recognized to the occurrence of uraninite, kasolite, uranophane, ishikawaite, thorite, uranothorite, monazite and zircon. Therefore, the results emphasize the need for regulatory compliance for construction and mylonite use in the industry to reduce the risk of radiation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Assessment of environmental health risks from mylonite-derived gamma radiation: a petrographic and dosimetric study

  • 期刊论文

  • 发表日期：

    2025年6月13日

查看全文
  • Mohamed Y. Hanfi,
  • Hassan A. A. Shahin,
  • Masoud S. Masoud,
  • Turki Kh. Faraj,
  • Ahmed E. Abdel Gawad

摘要

The study evaluates natural radioactivity (23⁸U, 232Th, 4⁰K) and evaluated radiological risks in mylonite from a geologically complex area. The elevated average activity concentrations in the thirty samples that were analyzed through high pure germanium (HPGe) Gamma -Spectrometry (238U: 895 ± 252 Bq kg−1; 232Th: 881 ± 275 Bq kg−1; 40K: 990 ± 437 Bq kg−1). Mean values of radiological indices such as radium equivalent activity (Raeq: 2231 Bq kg⁻1), absorbed dose rate (Dair: 986 nGy h⁻1), external and internal annual effective dose (AEDout: 1.21 mSv; AEDin: 4.84 mSv), and excess lifetime cancer risk (ELCR: 4.23 × 10–3)—surpass safety limits, indicates significant health risks. Statistical analysis emphasizes 232Th is associated with enrichment under metamorphism. The high-values of activity concentrations of 238U and 232Th are recognized to the occurrence of uraninite, kasolite, uranophane, ishikawaite, thorite, uranothorite, monazite and zircon. Therefore, the results emphasize the need for regulatory compliance for construction and mylonite use in the industry to reduce the risk of radiation.