The ambient gamma radiation around the Bellary thermal power plant was measured by Scintillometer of NaI (Tl) detector. The ambient gamma radiation level is mainly dependent upon the activity of primordial radionuclides present in soil and building materials. The activity of natural radionuclides presents in the soil and building materials of some villages around the Bellary thermal power plant is labelled by gamma-ray spectroscopy. The activity of natural radionuclides in soil such as ²²⁶Ra, ²³²Th and ⁴⁰K varies from 24 to 86.2 Bq·kg⁻¹, 45 to 115 Bq·kg⁻¹ and 145 to 910 Bq·kg⁻¹ with a mean value of 32.5, 79 and 640 Bq·kg⁻¹, respectively. The total measured annual effective dose rate of gamma varies from 0.85 to 1.37 mSv·year⁻¹ and the total calculated annual effective dose rate varies from 0.88 to 1.47 with a mean value of 1.18 mSv·year⁻¹. The measured and calculated values of ambient gamma radiation are very nearer to each other and show positive correlation with a correlation coefficient of 0.44. All the measured radiological indices in soil and building materials are lower than the safe level limit except fly ash bricks, fly ash brick shows a value higher than the safe level limit. The fly ash emitted from the thermal power plant enhances the radiation level in nearby villages. The results are presented and analyzed in this paper.

通过NaI闪烁仪（Tl）检测器测量了贝拉里热电厂周围的环境伽马辐射。环境γ辐射水平主要取决于土壤和建筑材料中存在的原始放射性核素的活性。贝拉里热电厂周围一些村庄的土壤和建筑材料中存在的天然放射性核素的活性用伽马射线光谱法标记。天然放射性核素的土壤中，如活动²²⁶镭，²³² Th和⁴⁰ ķ变化从24到86.2贝公斤· ^-1，45至115贝公斤· ^-1和145〜910贝公斤· ^-1与的平均值32.5、79和640 Bq·kg ^-1， 分别。γ的总测得年有效剂量率从0.85到1.37 mSv·year ^-1不等，而总的算出的年有效剂量率从0.88到1.47不等，平均值为1.18 mSv·year ^-1。环境γ辐射的测量值和计算值彼此非常接近，并且显示正相关，相关系数为0.44。除粉煤灰砖外，所有在土壤和建筑材料中测得的放射性指标均低于安全水平限值，粉煤灰砖显示的值高于安全水平限值。火力发电厂排放的粉煤灰提高了附近村庄的辐射水平。本文介绍并分析了结果。