To control outdoor exposure to natural radiation, assessment of activity concentrations of the radionuclides in soils is substantial. In this paper, the activity concentration of natural radionuclides (²²⁶Ra, ²³²Th, ⁴⁰K) was estimated for 174 agriculture soil samples using a sodium iodide detector (NaI) of (3” × 3”). Soil samples were collected from seven regions (56 locations) in EL-Minya governorate, Upper Egypt. The variability of natural activity concentration with soil’s textures was checked. The texture types of soil samples were silt clay loam, clay loam, sandy clay loam, and sandy silt loam. The obtained results indicate that the mean values of specific activity ranged from 11.3 ± 0.5 (sandy silt loam) to 21 ± 1(silt clay loam), 6.8 ± 0.3 (sandy silt loam) to 13.7 ± 0.7 (sandy clay loam), and 112 ± 5 (sandy silt loam) to 272 ± 13.6 (sandy clay loam) Bq kg⁻¹ for ²²⁶Ra, ²³²Th, and ⁴⁰ K, respectively. The obtained results were compared with the global average and tolerable limits as recommended in UNSCEAR 2008. On the other side, the radiological hazard resulting from the total natural radioactivity in the studied soil samples was estimated by different approaches. The obtained values were within the recommended safety limit and do not pose significant radiation hazards.

中文翻译：

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上埃及自然放射性水平及其放射性危害对农业土壤质地的影响

为了控制室外暴露于自然辐射中，评估土壤中放射性核素的活动浓度非常重要。本文研究了天然放射性核素（²²⁶ Ra，²³² Th，⁴⁰使用（3”×3”）的碘化钠检测器（NaI）估算了174种农业土壤样品的K）。从上埃及的EL-Minya省的七个地区（56个地点）收集了土壤样品。检查了自然活动浓度随土壤质地的变化。土壤样品的质地类型为粉质壤土，粘土壤土，沙质壤土和沙质壤土。得到的结果表明，比活的平均值在11.3±0.5（砂质壤土）至21±1（粉质壤土），6.8±0.3（砂质壤土）至13.7±0.7（砂质壤土），和112±5（沙质壤土淤泥），以272±13.6（砂质粘壤土）贝千克^-1为²²⁶镭，²³² Th和⁴⁰ 分别为K。将获得的结果与UNSCEAR 2008中建议的全球平均水平和可​​容忍限值进行比较。另一方面，通过不同方法估算了研究土壤样品中总自然放射性造成的放射性危害。所获得的值在建议的安全极限范围内，不会造成明显的辐射危害。