Malkara coals are located in the Oligocene-aged Danişmen Formation in the Thrace Tertiary coal basin. The Danişmen Formation consists of limestone, sandstone, tuffite, siltstone, claystone and intercalated coal. Elemental and specific natural radionuclide concentrations of lignites collected from Tekirdağ–Malkara coalfield were determined, and the associated radiological risk was assessed. In order to examine the depth-dependent radionuclide concentration changes, samples were taken from top, middle and bottom parts of the boreholes. Gamma spectrometric measurements of radionuclide activities were performed with HPGe detector. The calculated mean ²²⁶Ra, ²³²Th and ⁴⁰K concentrations were 27.0 ± 3.57, 18.9 ± 3.28 and 155 ± 36.1 Bq kg⁻¹, and the measured U, Th, Pb and K concentrations were 4.04, 6.27, 10.6 ppm and 0.82%, respectively. Findings were comparable with the reported literature for Turkey and other countries from the world. The dose due to the radionuclide content of lignites was not very high to pose a serious health risk.

Malkara煤位于色雷斯第三纪盆地的渐新世时代的达尼什门组。Danişmen组由石灰岩，砂岩，凝灰岩，粉砂岩，粘土岩和插层煤组成。确定了从Tekirdağ–Malkara煤田收集的褐煤的元素和特定天然放射性核素浓度，并评估了相关的放射风险。为了检查随深度变化的放射性核素浓度变化，从井眼的顶部，中部和底部取样。用HPGe检测器进行放射性核素活性的伽马能谱测量。计算出的²²⁶ Ra，²³² Th和⁴⁰ K平均浓度分别为27.0±3.57、18.9±3.28和155±36.1 Bq kg ^-1，测得的U，Th，Pb和K浓度分别为4.04、6.27、10.6 ppm和0.82％。研究结果与土耳其和世界其他国家的报道文献具有可比性。褐煤中放射性核素含量引起的剂量不是很高，存在严重的健康风险。