인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
크롬 서지관리 다운로드
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
This study investigates the distribution, transfer, and potential ecological risks of naturally occurring radioactive materials, including radon-222 (<sup>222</sup>Rn), radium-226 (<sup>226</sup>Ra), thorium-232 (<sup>232</sup>Th), and potassium-40 (<sup>40</sup>K), in the aquatic ecosystem of Nasser Lake, Egypt. As Egypt's largest freshwater reservoir and a critical source of drinking water and fish, Nasser Lake plays a key role in environmental stability and public health. A total of 40 environmental samples-sediment, water, aquatic plants, and fish-were collected from 10 strategically selected sites around the lake. Gamma spectroscopy using sodium iodide activated with thallium [NaI(Tl)] detectors and AlphaGUARD radon monitoring systems was employed to measure radionuclide activity concentrations. Spatial distribution patterns were analyzed using Geographic Information System (GIS) techniques to identify zones of elevated radioactivity. The highest concentrations of <sup>226</sup>Ra, <sup>232</sup>Th and <sup>40</sup>K were recorded in sediment samples near the High Dam, reaching 10.99 ± 0.42 Bq kg<sup>-1</sup>, 23.94 ± 1.91 Bq kg<sup>-1</sup>, and 277.38 ± 23.86 Bq kg<sup>-1</sup>, respectively. A strong positive correlation (Pearson's r = 0.913) was observed between <sup>226</sup>Ra and <sup>222</sup>Rn exhalation rates, confirming that sediment accumulation significantly contributes to local radiological emissions. Bioaccumulation studies showed progressive uptake of radionuclides along the aquatic food chain, with fish exhibiting a bioaccumulation factor (BAF) of 0.74 for <sup>226</sup>Ra. Estimated annual radiation doses from fish consumption reached up to 6.435 microsieverts per year (µSv y<sup>-1</sup>), remaining below international reference levels established by the World Health Organization (WHO). However, the combination of localized contamination near the High Dam and high fish consumption in nearby communities may present long-term radiological exposure risks. These findings highlight the importance of continuous monitoring of radioactive contaminants in sediment, water, and aquatic organisms in Nasser Lake. The study also provides a transferable framework for assessing the behavior of technologically enhanced naturally occurring radioactive materials (TENORM) in freshwater environments and supports the goals of the United Nations Sustainable Development Goals (SDGs) for clean water and good health.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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