Department of Physics, Guru Gobindsingh Indraprastha University, New Delhi-110078, India.
Radiation Standard Analysis Laboratory, Atomic Minerals Directorate For Exploration and Research, Hyderabad 500016, India.
Radiat Prot Dosimetry. 2024 Jul 17;200(11-12):1127-1131. doi: 10.1093/rpd/ncae110.
Coal based thermal power plants contribute about ~ 72% of the power generation in India. Indian coal is of bituminous type, having a high ash content with 55-60% ash. Due to considerable environmental importance the collected fly ash has become a subject of worldwide interest in recent years. In the present study radon exhalation rate and the activity concentration of 226Ra, 232Th and 40K radionuclides in fly ash samples from Kasimpur Thermal Power Plant, Aligarh, Uttar Pradesh, India have been measured by 'Sealed Can technique' using LR-115 type II detectors and a low-level NaI (Tl)- based gamma-ray spectrometer, respectively. Radon exhalation rate has been found to vary from 57.1 ± 5.3 to 119.4 ± 7.7 mBq m-2 h-1 with an average value of 87.3 ± 5.8 mBq m-2 h-1. Activity concentration of 226Ra ranged from 20.0 ± 8.5 to 30.0 ± 9.7 Bq kg-1 with an average value 23.4 ± 9.0 Bq kg-1, 232Th ranged from 17.0 ± 9.9 to 69.0 ± 13.8 Bq kg-1 with an average value of 46.5 ± 12.1 Bq kg-1 and 40K ranged from 130.0 ± 7.2 to 332.0 ± 11.1 Bq kg-1 with an average value of 177.0 ± 8.1 Bq kg-1.
印度的火力发电站主要依靠煤炭，约占总发电量的 72%。印度的煤炭属于烟煤，灰分含量高，约为 55-60%。由于其具有重要的环境意义，近年来，煤灰的收集已成为全世界关注的焦点。在本研究中，使用 LR-115 型 II 探测器和基于低水平 NaI(Tl)的伽马射线谱仪，通过“密封罐技术”分别测量了印度北方邦阿里格尔的 Kasimpur 火力发电厂的粉煤灰样品中的氡析出率以及 226Ra、232Th 和 40K 放射性核素的活度浓度。氡析出率的范围为 57.1±5.3 至 119.4±7.7 mBq m-2 h-1，平均值为 87.3±5.8 mBq m-2 h-1。226Ra 的活度浓度范围为 20.0±8.5 至 30.0±9.7 Bq kg-1，平均值为 23.4±9.0 Bq kg-1，232Th 的活度浓度范围为 17.0±9.9 至 69.0±13.8 Bq kg-1，平均值为 46.5±12.1 Bq kg-1，40K 的活度浓度范围为 130.0±7.2 至 332.0±11.1 Bq kg-1，平均值为 177.0±8.1 Bq kg-1。
