[en] The radioactivity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K natural radionuclides in Lao Portland cement samples were measured using a gamma-spectrometry with a HPGe detector. The activity concentrations were found to vary from 28.32 ± 2.23 to 65.50 ± 2.83 Bq kg-1 with a mean value of 41.12 ± 2.44 Bq kg^-1 for ²²⁶Ra; from 7.25 ± 2.00 to 44.01 ± 2.45 Bq kg^-1 with a mean of 16.60 ± 2.37 Bq kg^-1 for ²³²Th and from 49.19 ± 4.27 to 196.74 ± 4.75 Bq kg^-1 with a mean of 141.48 ± 4.50 Bq kg^-1 for ⁴⁰K, respectively. The radiological parameters were estimated to assess the potential radiological hazard including radium equivalent activity, total external absorbed dose rate in outdoor air at 1 m above the earth's surface, the annual effective dose, the gamma and alpha-indices were calculated using the activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K. The results obtained in this study show no significant radiological hazards arising from using Lao Portland cement for building construction. (authors)