Abstract. Geological and radiometnc investigations for radioactive materials in the Wadi Alalla area revealed the presence of some uranium-mineralized veins in pink granite rocks forming the prominent masses of Gebel El Erediya and Gebel El Missikat. These veins are mostly composed of siliceous material showing some variations from proper silica or jasperoid veins to ferruginous and siliceous mylonites filling some fracture zones. However, not all siliceous veins in these granite masses are mineralized or radioactive. This paper deals mainly with the distribution pattern of the radioactive veins associated with the granite masses of Gebel El Erediya and Gebel El Missikat, their characteristic geological features and geometry, as well as their relationship with the major structural features of the Wadi Atalla area. It has been found that most of the radioactive veins in El Erediya pluton are of the fracture-filling type, predominantly of a NNW-SSE trend. The similar radioactive veins in El Missikat pluton are of a vein-type, the majority of which extend in an ENE-WSW direction. Structural analysis shows that this variation is mostly due to some rotational movement in clockwise direction along a major NW-SE fault line crossing the area and affecting both granite masses. This may be caused by the compressional stress having acted upon the area and the whole region for a considerable duration. The results of this work are also in favour of the close genetic relationship between these radioactive veins and their enclosing pink granite masses.