Samarkand State University, Samarkand, Uzbekistan, 140104.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
Environ Monit Assess. 2023 Nov 3;195(12):1412. doi: 10.1007/s10661-023-12018-7.
This study investigates soil radioactivity at the Pomuk gas field in Uzbekistan, a region with history of underground nuclear activity. Using a NaI (Tl) scintillation gamma spectrometer, soil samples were analyzed for concentrations of Th, Ra, K, and Cs. Concentrations were found to be in the range of 19.0-31.0 Bq/kg for Th, 12.0-32.0 Bq/kg for Ra, 450.0-634.0 Bq/kg for K, and 2.4-11.0 Bq/kg for Cs. Surface radon flux density was measured using a coal sorbent-based passive method, with values ranging from 26.1 to 79.0 mBq/ms. Mean activity values for radium equivalent (Ra) and gamma representative level index (I) were calculated to be 75.2-96.5 Bq/kg and 0.3-0.4 Bq/kg, respectively. The absorbed airborne gamma dose rates (GDR) varied between 41.0 and 52.0 nGy/h, while annual effective dose rates (AEDR) were 0.3-0.4 μSv/year. The radiological risk assessment indicates the area is within safe limits for the population and environment, providing a foundation for future radiological monitoring programs.
本研究调查了乌兹别克斯坦波穆克气田的土壤放射性，该地区有地下核活动的历史。使用碘化钠（Tl）闪烁伽马谱仪，分析了土壤样品中钍、镭、钾和铯的浓度。结果表明，钍的浓度在 19.0-31.0 Bq/kg 之间，镭的浓度在 12.0-32.0 Bq/kg 之间，钾的浓度在 450.0-634.0 Bq/kg 之间，铯的浓度在 2.4-11.0 Bq/kg 之间。采用基于煤吸附剂的被动法测量表面氡通量密度，范围为 26.1-79.0 mBq/ms。计算得出镭当量（Ra）和伽马代表性水平指数（I）的平均活度值分别为 75.2-96.5 Bq/kg 和 0.3-0.4 Bq/kg。吸收性空气伽马剂量率（GDR）在 41.0 和 52.0 nGy/h 之间变化，而年有效剂量率（AEDR）为 0.3-0.4 μSv/year。放射性风险评估表明，该地区对人口和环境处于安全范围内，为未来的放射性监测计划提供了基础。
