The inventories and the possible mechanisms behind the relative deficiency of both radium and uranium release processes within an elevated gamma-anomalous rock were investigated. A field survey was performed on the highest radioactive anomalous zone that was recorded at Jabal Al Alam (20° 13′ 10.06″ N and 44° 14′ 32.13″), with the ferruginous sandstone, iron oxide band, and iron concretions (with uranium content and reaching up to1500 ppm). The chemical analyses and the laboratory’s gamma-ray spectrometric measurements demonstrated high uranium levels in the analyzed rock samples of the Wajid Sandstone (up to 1000 ppm). The borehole geophysical logs further confirmed that the radioactive anomalies are attributed to the sandstone sequence of the Wajid Formation that is often found associated with elevated concentrations of uranium. The groundwater samples taken from the wells tapping the Wajid aquifer showed uranium concentrations ranging from 0.01 to 5.5 ppb (μg/L). The average ²²⁶Ra in groundwater samples was 0.2 Bq L⁻¹. The majority of the ²²⁶Ra and ²²⁸Ra activities were below the lower limit of detection (LLD). The radiochemical analyses of water samples from the Wajid aquifer display low concentrations of both uranium and ²²⁶Ra, with relation to uranium content in host rocks. This was attributed to the fact that uranium is susceptible to form iron oxide complexes, causing them to precipitate in a more stable form. Furthermore, iron oxides coat the sand grains of the Wajid Formation and accordingly might act as a foundation for re-adsorption for both uranium and radium, resulting in their relative deficiency in the surrounding water. The coating might also act as a physical barrier resulting in hindrance of the recoil nuclei due to its significant thickness (several orders of magnitude) compared with that of the average (120 nm) whole alpha-recoil track (ART). The coating layer thickness was determined via scanning electron microscopy (SEM) and was found to be up to 180 μm.

研究了高架γ-异常岩石中镭和铀释放过程相对不足的清单和可能的机理。在Jabal Al Alam记录的最高放射性异常区（20°13′10.06” N和44°14′32.13”）进行了野外调查，其中含铁质砂岩，氧化铁带和铁矿（含铀）含量并达到1500 ppm）。化学分析和实验室的伽玛射线能谱测量表明，瓦吉德砂岩的分析岩石样品中铀含量很高（最高1000 ppm）。钻孔地球物理测井进一步证实了放射性异常归因于瓦吉德组的砂岩层序，通常发现这与铀浓度升高有关。从开采Wajid含水层的井中抽取的地下水样品显示铀浓度范围为0.01到5.5 ppb（μg/ L）。平均地下水样品中的²²⁶ Ra为0.2 Bq L ^-1。大部分的²²⁶ Ra和^228个太阳神活动低于检测（LLD）的下限。瓦吉德含水层水样品的放射化学分析显示铀和^226的浓度均较低Ra，与主岩中的铀含量有关。这归因于铀易于形成氧化铁络合物，使它们以更稳定的形式沉淀的事实。此外，氧化铁覆盖了Wajid地层的沙粒，因此可能充当铀和镭的再吸附的基础，从而导致周围水相对缺乏。与平均（120 nm）的整个α-反冲轨迹（ART）相比，该涂层的厚度大（几个数量级），因此涂层也可能充当物理屏障，导致后坐核受阻。涂层厚度通过扫描电子显微镜（SEM）确定，并且发现至多180μm。