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Concentrations of ²³⁸U, ²³²Th, ²²⁶Ra, ⁴⁰K and ¹³⁷Cs are measured in collected soil samples from various locations in the Thrace region of Turkey. The activity concentrations range from 12.82 to 101.75 Bq kg⁻¹ d.w. (dry weight) for ²³⁸U, from 5.16 to 73.34 Bq kg⁻¹ d.w. for ²³²Th, from 185.54 to 5399 Bq kg⁻¹ d.w. for ⁴⁰K and from 11.42 to 90.73 Bq kg⁻¹ d.w. for ²²⁶Ra. In addition to naturally occurring radionuclides, ¹³⁷Cs activity concentration is determined between 3.05 and 46.78 Bq kg⁻¹ d.w. for soil samples. Determination of the radiological hazard is achieved through calculations of the external terrestrial gamma dose rate in air (nGy h⁻¹) and annual effective dose rate (mSv year⁻¹) and the results are compared with the similar works in different countries.