本研究的目的是通过考察Wadi El Gemal岛的地形、矿物学、地球化学和放射性分布来评估其自然资源和放射性风险。该岛位于埃及东南部沙漠的Wadi El Gemal出口处，根据Landsat图像，岛屿的独特形状类似于一只海豚。它是Wadi El Gemal-Hamata保护区的一部分，以其多样化的环境、地质、经济和考古特征而闻名，包括最近的珊瑚礁、沙层堆积、第四纪碳酸盐沉积物和红树林。岛上的主要自然资源包括动物、红树林和植物。通过使用NaI探测器分析从岛上采集的样品，测量了238U、232Th、226Ra和40K等放射性核素的浓度，结果显示其符合UNSCAR指南的可接受水平。采集样品的放射性核素238U、232Th、226Ra和40K的活度浓度分别为32.55 ± 9、12.63 ± 4、12.49 ± 4和325 ± 34 Bq/kg。关于放射性危害指标，γ射线吸收剂量率值为36.06 ± 5.42 nGy/h，镭当量活度为73.88 ± 14.4 Bq/kg，室内年有效剂量为0.18 ± 0.03 mSv/y，室外年有效剂量为0.04 ± 0.01 mSv/y，内部指数为0.29 ± 0.05，外部指数为0.2 ± 0.03，以及过量寿命癌症指数为0.15 ± 0.05 × 10-3。这表明这些沉积物没有显著的风险。版权所有 © 2023 Elsevier Ltd。保留所有权利。

The objective of this study is to assess the natural resources and radiological risks of Wadi El Gemal Island by examining its topography, mineralogy, geochemistry, and radioactive distributions. This island, which is situated at the outlet of Wadi El Gemal in Egypt's southeastern Desert, has a unique shape resembling a dolphin based on Landsat imagery. It's a part of the Wadi El Gemal-Hamata Protectorate and is notable for its diverse environmental, geological, economic, and archeological features, including recent reefs, sandy deposits, Quaternary carbonate sediments, and mangroves. The main natural resources on the island are fauna, mangrove forests, and flora. Samples collected from the island were analyzed using a NaI detector to measure the concentrations of radionuclides such as 238U, 232Th, 226Ra, and 40K, which were found to be within acceptable levels according to UNSCAR guidelines. The radionuclide 238U, 232Th, 226Ra, and 40K activity concentrations of the collected samples were 32.55 ± 9, 12.63 ± 4, 12.49 ± 4, and 325 ± 34 Bq/kg, respectively. Regarding radiological hazard indices, the values of absorbed gamma dose rate (36.06 ± 5.42 nGy/h), radium equivalent activity (73.88 ± 14.4 Bq/kg), annual effective dose indoor (0.18 ± 0.03 mSv/y) and outdoor (0.04 ± 0.01 mSv/y), internal (0.29 ± 0.05) and external (0.2 ± 0.03) indices, and excess lifetime cancer index (0.15 ± 0.05 × 10-3).This is suggest that there is no significant risk associated with these sediments.Copyright © 2023 Elsevier Ltd. All rights reserved.