El-Dine Nadia Walley
Nuclear Physics Laboratory, Faculty of Girls, Ain Shams University, Heliopolis, Cairo, Egypt.
Appl Radiat Isot. 2008 Jan;66(1):80-5. doi: 10.1016/j.apradiso.2007.07.022. Epub 2007 Aug 3.
Twenty rock samples collected from North Eastern Desert in Egypt have been investigated. Natural radionuclide contents have been measured by gamma-ray spectrometry employing a shielded HPGe detector. The activities of (238)U, (232)Th and (40)K have been determined in Bq/kg dry weight. The absorbed dose rate of gamma radiation ranged from 100.48 to 22,140.53 nGy/h. The representative external hazard index values (H(ex)) for the corresponding samples were estimated. In the present work, the state of radioactive disequilibrium in the U-series at Wadi Baligh area was studied. The activity ratios between (226)Ra/(214)Pb and (214)Pb/(214)Bi were measured. The thorium-to-uranium concentration ratios (Clark value) were also estimated.
对从埃及东北部沙漠采集的20个岩石样本进行了研究。使用屏蔽型高纯锗探测器通过伽马射线能谱法测量了天然放射性核素含量。已测定了干重中每千克贝可勒尔（Bq/kg）的（238）U、（232）Th和（40）K活度。伽马辐射的吸收剂量率范围为100.48至22140.53纳戈瑞/小时（nGy/h）。估算了相应样本的代表性外部危害指数值（H(ex)）。在本研究中，对瓦迪巴利赫地区铀系中的放射性不平衡状态进行了研究。测量了（226）Ra/（214）Pb和（214）Pb/（214）Bi之间的活度比。还估算了钍与铀的浓度比（克拉克值）。
