埃及东部沙漠和尼罗河谷沉积岩放射性衰变产热评估
Evaluation of heat generation by radioactive decay of sedimentary rocks in Eastern Desert and Nile Valley, Egypt.
作者信息
Abbady Adel G E
机构信息
Physics Department, Faculty of Science, South Valley University, Qena, Egypt.
出版信息
Appl Radiat Isot. 2010 Oct;68(10):2020-4. doi: 10.1016/j.apradiso.2010.03.023. Epub 2010 May 15.
Radioactive heat-production (RHP) data of sedimentary outcrops in Gebel Anz (Eastern Desert) and Gebel Sarai (Nile Valley) are presented. A total of 103 rock samples were investigated, covering all major rock types of the areas. RHP were derived from uranium, thorium and potassium concentrations measured from gamma-radiation originating from the decay of (214)Bi ((238)U series), (208)Tl ((232)Th series) and the primary decay of (40)K, obtained with a NaI (Tl) detector. The heat-production rate of Gebel Anz ranges from 0.94 (Nubai Sandstone ) to 5.22 microW m(-3) (Duwi Formation). In Gebel Sarai it varies from 0.82 (Esna Shale) to 7 microW m(-3) (Duwi Formation). The contribution due to U is about 62%, from Th is 34% and 4% from K in Gebel Anz. The corresponding values in Gebel Sarai are 69.6%, 26.9% and 3.5%, respectively. These data can be used to discuss the effects of the lateral variation of the RHP rate on the heat flux and the temperature fields in the upper crust.
本文给出了盖贝尔安兹（东沙漠）和盖贝尔萨赖（尼罗河谷）沉积露头的放射性生热（RHP）数据。共调查了103个岩石样本，涵盖了这些地区的所有主要岩石类型。RHP由通过NaI（Tl）探测器测量的γ辐射得出，该γ辐射源自（214）Bi（（238）U系列）、（208）Tl（（232）Th系列）的衰变以及（40）K的一次衰变所产生的铀、钍和钾浓度。盖贝尔安兹的生热率范围为0.94（努拜砂岩）至5.22微瓦每立方米（杜威组）。在盖贝尔萨赖，其变化范围为0.82（埃斯纳页岩）至7微瓦每立方米（杜威组）。在盖贝尔安兹，铀的贡献约为62%，钍为34%，钾为4%。在盖贝尔萨赖，相应的值分别为69.6%、26.9%和3.5%。这些数据可用于讨论RHP率的横向变化对上地壳热通量和温度场的影响。
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