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首页> 外文期刊>Journal of Applied Life Sciences International >Distribution of Natural Radionuclides in the Surface Soil in Some Areas of Agriculture and Grazing Located in West of Riyadh, Saudi Arabia
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Distribution of Natural Radionuclides in the Surface Soil in Some Areas of Agriculture and Grazing Located in West of Riyadh, Saudi Arabia

机译：沙特阿拉伯利雅得西部一些农业和放牧地表土壤中天然放射性核素的分布

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摘要

The distribution of 238U (Uranium-238), 232Th (Thorium-232), 40K (Potassium-40) and 137Cs (Caesium-137) in surface soil at various sites of agriculture and grazing located in west of Riyadh, Saudi Arabia was investigated under natural field conditions. These sites were located at cities of Huraimla, Thadeq and Sajir, Saudi Arabia. The latitude of these sites was in the range of 25.08 °N to 25.30 °N, the longitude was in the range of 44.43 °E to 46.17 °E and the altitude was in the range of 721 m to 803 m. Data were collected by scanning the surface soil by the help of the Mole (proximal sensor for gamma radiation, the soil company, the Netherlands). The Mole was mounted on fabricated iron carriage. Four surfaces soil in each location were scanned. From the data analysis, average activity concentration was determined for 40K (range from 96.81 to 337.91 Bq/kg), 137Cs (range from 8.04 to 17.13 Bq/ kg), 238U (range from 13.02 to 38.70 Bq/kg) and 232Th (range from 10.47 to 33.73 Bq/ kg). The best-fitting relationship between the concentrations of 232Th and 40K versus 238U and also of 40K versus 232Th was found to be linear type with reasonable coefficients of determination (R2). However, R2 of 0.799 for 232Th vs. 238U, 0.6366 for 40K vs. 238U and 0.4295 for 40K vs. 232Th. The 232Th /238U, 40K /238U and 40K /232Th ratios (slopes) extracted were equal to 0.9124, 8.5351 and 6.6979, respectively. The total annual effective dose for the studied locations was in the range of 0.02 to 0.06 mSv/year. The calculated external hazard index value for the soil samples studied was ranged between 0.10 and 0.30 with an average value of 0.20. The results showed a reasonably low radiation outdoor absorb dose (less than unity), which is a good indication for the farmers for agricultural activities and for animal pasture.
机译：238 U（铀238）， 232 Th（T 232）， 40 K（钾40）和 137 Cs（铯137）进行了研究。这些地点位于沙特阿拉伯的萨达克胡拉姆拉和萨吉尔市。这些地点的纬度在25.08°N至25.30°N的范围内，经度在44.43°E至46.17°E的范围内，海拔在721 m至803 m的范围内。通过借助the鼠（用于伽马辐射的近端传感器，荷兰土壤公司）扫描地表土壤来收集数据。 Mo鼠被安装在装配好的铁架上。扫描每个位置的四个表面土壤。根据数据分析，确定 40 K（范围从96.81至337.91 Bq / kg）， 137 Cs（范围从8.04至17.13 Bq / kg）的平均活性浓度， 238 U（范围从13.02至38.70 Bq / kg）和 232 Th（范围从10.47至33.73 Bq / kg）。 232 Th和 40 K的浓度与 238 U以及 40 K的浓度之间的最佳拟合关系相对于 232 Th是线性类型，具有合理的测定系数（R 2 ）。但是， 232 Th对 238 U的R 2 为0.799，对于 40 K的R 2 U为0.6366。 > 238 U和0.4295（对于 40 K）与 232 Th。 232 Th / 238 U， 40 K / 238 U和 40 K / 232 Th比率（斜率）分别等于0.9124、8.5351和6.6979。研究地点的年度总有效剂量为0.02至0.06 mSv /年。计算得出的土壤样品的外部危害指数值介于0.10和0.30之间，平均值为0.20。结果表明，室外辐射吸收剂量较低（小于1），这对于农民进行农业活动和畜牧业是一个很好的指示。

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