The activity concentration of ²³⁵U, ²³⁸U, ^234mPa, ²²⁶Ra, ²³²Th and ⁴⁰K were determined using gamma ray spectrometry with a high-purity germanium (HPGe) detector for eighteen samples of phosphate rocks collected from Wadi Qena and Abu-Tartor mine. To obtain the exact information about the measurement of ²³⁸U by gamma-ray spectroscopy, it is essential that any one of the daughters of ²³⁸U should exist in equilibrium with ²³⁸U. This condition is fulfilled by taking the average of all present measurements of daughters of ²³⁸U, namely ^234mPa, ²²⁶Ra, ²¹⁴Bi and ²¹⁴Pb. The average activity concentration for phosphate rocks of Wadi Qena are 52.31, 864.69, 54.14 and 87.39 for ²³⁵U, ²³⁸U, ²³²Th and ⁴⁰K, respectively, while that of Abu-Tartor are 24.80, 419.13, 48.21 and 115.95 for ²³⁵U, ²³⁸U, ²³²Th and ⁴⁰K, respectively. The results were compared with different locations in Egypt and the world abroad reported in the literature. The radiation hazard to the occupational workers and public, the radium equivalent activities in Bq/kg, external and internal hazards and dose rate in nGy/hr are calculated. It seems that Abu-Tartor phosphate deposit has the lowest radioactivity level for ²³⁵U, ²³⁸U and ²³²Th of exploited phosphate of sedimentary origin.