[en] Cement samples commonly used in building constructions in Egypt and Yemen were analyzed for natural radioactivity using a Hyper-pure Germanium detector (HPGe). The radioactivity content of ²³⁸U, ²³²Th and ⁴⁰K isotopes in the cement samples was studied. In the Egyptian cement samples, the specific activities for mentioned isotopes were found as follows: for ²³⁸U, ranged 18 - 35 Bq/kg, with an average value of 27.9±6.9 Bq/kg; for ²³²Th, ranged 7.2 - 16.1 Bq/kg, with an average value of 13.1±4.1 Bq/kg; for ⁴⁰K, ranged 24.8 -107.1 Bq/kg, with an average value of 73.3 ± 35.2 Bq/kg. In the Yemenian cement samples, specific activities for mentioned isotopes were found as follows: for ²³⁸U, in the range 19.6 – 193 Bq/kg, with an average of 68.8± 71.9; for ²³²Th, in the range 17.3 – 256 Bq/kg, with an average of 79.1±102.2 Bq/kg; for ⁴⁰K, in the range 272.7-858.6 Bq/kg, with an average of 421.6±252.3 Bq/kg. In both country cases, the specific activities were compared with the reported data in other countries and world average limits (global values reported in UNSCEAR publications). The determined specific activity of ²³⁸U, ²³²Th and ⁴⁰K was found to be less than the world average values (50 Bq/kg, 50 Bq/kg and 500 Bq/kg, respectively, for the considered nuclides) except for Block waver cement samples. It was shown that the averages of radiation hazard parameters and the annual effective dose for cement samples are lower than the accepted level of 370 Bq/kg for Radium equivalent (Ra_eq) and lower than unit for internal hazard index, the external hazard index and the annual effective dose, except for Block waver cement samples. Excluding the Block waver cement samples, the rest of cement samples do not pose radiological hazards when are used as materials for buildings construction. (author).