墨西哥非传统油田土壤中的天然放射性核素基线
Beatriz Hernandez-Mendez1, Arturo Angeles Carranza1, Sergio Suarez-Contreras1
1Instituto Nacional de Investigaciones Nucleares, Carretera Mexico-Toluca S/N, La Marquesa, Ocoyoacac C.P. 52750, Estado de Mexico.
Radiation protection dosimetry
|February 21, 2025
概括
在碳化合物区测量了来自 (238U) 和 (232Th) 的土壤放射性. 基线水平与全球平均值可比,表明没有先前的产业影响.
科学领域:
- 环境科学 环境科学
- 放射化学 放射化学是指辐射化学.
- 地质地质地质地质地质地
背景情况:
- 自然存在的放射性物质 (NORM) 存在于碳化合物沉积物中.
- 在像水力压裂这样的工业活动之前,了解基线放射性至关重要.
- 以前的工业活动可以改变土壤中的NORM水平.
研究的目的:
- 从三个碳化合物区的土壤中确定238U,232Th及其衰变产品的基线活性度.
- 评估测量的放射性水平是否偏离全球平均值.
- 确定是否有证据表明先前的工业影响对NORM水平.
主要方法:
- 从三个不同的碳化合物区采集了土壤样本.
- 测量了238U,232Th和主要衰变产物 (例如228Ra,226Ra) 的活性度.
- 结果与联合国安理会报告的全球平均值进行了比较.
主要成果:
- 238U的活性度在9.2 ± 0.5至115.8 ± 7.5 Bq kg-1.5之间.
- 228Ra的活性度在8.3 ± 2.0到50.0 ± 4.4 Bq kg-1.0之间.
- 226Ra的活性度在24.1±2.3到86.8±4.7 Bq kg-1之间.
- 测量水平与全球土壤平均值相当.
- 跨区域的238U和232Th衰变系列的类似活动度模式表明没有工业影响.
结论:
- 在所研究的碳化合物区域中,确定的基线放射性与全球平均值相当.
- 类似的NORM模式表明,之前没有任何重要的工业活动.
- 这些基线数据对于未来的环境监测和与水力压裂等工业活动有关的影响评估至关重要.
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