Abstract The El Gilf El Kiber area is one of the most promising areas for urban growth and reclamation projects in the southwest of Egypt. In the study area, the lithological units vary in age from Precambrian (mainly granite) to Quaternary (mainly sand sediments). The analysis of airborne magnetic and gamma-ray spectrometry data was incorporated into that of the remote sensing data (Landsat-8). The integrated analysis was used to detect the lithological distributions and to delineate the subsurface basement rocks that control the radioactivity in the study area. It was also used to determine the relationship between radiogenic heat production (RHP) and land surface temperature (LST) that was retrieved from the Landsat-8 thermal infrared sensor (TIRS) data. The output of the principal component analysis (PCA) of Landsat-8 Operational Land Imager (OLI) data is a false-color map (PC1, PC2, and PC3 as red, green, and blue, respectively) displaying the various lithological units in the study area. The LST map, calculated from Landsat-8 TIRS data, shows that the surface temperatures range from approximately 41 to 53 °C. The highest concentrations of eU, eTh, and K in the area were 25 ppm, 121 ppm, and 7.8%, respectively. The RHP values ranged from 1.1 μW/m3 to 15.1 μW/m3. These relatively high anomalies are associated with basement outcrops and the sedimentary rocks overlying shallow basement rocks. The total horizontal derivative (THD) of the magnetic data delineates the horizontal extension of the basement rocks. The Curie point depth (CPD), estimated from magnetic data, ranges from 35.5 km to 41.0 km. The results also exhibited geothermal gradients ranging from 16.10 °C/km to 14.14 °C/km, and heat flow ranges from 35.4 mW/m2 to 40.8 mW/m2. It was evident after comparing that the RHP and LST maps exhibited the same features as the gamma-ray spectrometric maps. Moreover, the areas around the basement rocks exhibited higher radioactivity, RHP, and temperature than the basement rocks themselves.

中文翻译：

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干旱环境中自然放射性水平、放射性产热和地表温度之间的比较：埃及 El Gilf El Kiber 地区的案例研究

摘要 El Gilf El Kiber 地区是埃及西南部城市发展和填海工程最有前景的地区之一。研究区岩性单元年龄从前寒武纪（以花岗岩为主）到第四纪（以砂岩沉积为主）不等。对机载磁和伽马射线光谱数据的分析被纳入到遥感数据（Landsat-8）的分析中。综合分析用于检测岩性分布并描绘控制研究区放射性的地下基底岩石。它还用于确定从 Landsat-8 热红外传感器 (TIRS) 数据中检索到的辐射热产生 (RHP) 和地表温度 (LST) 之间的关系。Landsat-8 Operational Land Imager (OLI) 数据的主成分分析 (PCA) 的输出是一张假彩色图（PC1、PC2 和 PC3 分别为红色、绿色和蓝色），显示了研究区。根据 Landsat-8 TIRS 数据计算的 LST 地图显示地表温度范围约为 41 至 53 °C。该地区的 eU、eTh 和 K 的最高浓度分别为 25 ppm、121 ppm 和 7.8%。RHP 值范围从 1.1 μW/m3 到 15.1 μW/m3。这些相对较高的异常与基底露头和覆盖在浅基底岩石上的沉积岩有关。磁数据的总水平导数 (THD) 描绘了基底岩石的水平延伸。根据磁数据估计的居里点深度 (CPD) 范围从 35.5 公里到 41.0 公里。结果还显示地热梯度范围为 16.10 °C/km 至 14.14 °C/km，热流范围为 35.4 mW/m2 至 40.8 mW/m2。比较后很明显，RHP 和 LST 图表现出与伽马射线光谱图相同的特征。此外，基岩周围区域的放射性、RHP 和温度高于基岩本身。