In this study, the gamma radiation attenuation was experimentally investigated for soil samples with different texture collected from Bursa Province, Turkey. Firstly, physical and chemical properties (e.g., density, particle size distribution, lime content, organic matter and chemical composition) of these soils were determined by several methods. The transmission measurements of soils performed by using Am-241, Cs-137, Co-60 and Na-22 sources and 2 × 2 inch NaI(Tl) scintillation detector were used to calculate shielding parameters, mass attenuation coefficient, half value layer and tenth value layer values, of these samples in form of pressed powder pellets. The values of these important parameters have been found to vary with gamma-ray energy and chemical composition of the studied soil samples. For instance, the mass attenuation coefficients were decreased with increasing gamma-ray energies and, with the increase in contribution of MgO and Na components, caused better absorption. The effect of compression pressure on attenuation coefficient was also investigated, and better absorption was observed for the sample pressed by high value of press force.

中文翻译：

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土耳其布尔萨土壤在59.5–1332.5 keV能量范围内的伽马射线衰减研究

在这项研究中，通过实验研究了从土耳其布尔萨省收集的具有不同质地的土壤样品的伽马辐射衰减。首先，通过几种方法确定这些土壤的物理和化学性质（例如，密度，粒度分布，石灰含量，有机物和化学组成）。利用Am-241，Cs-137，Co-60和Na-22离子源以及2×2英寸NaI（Tl）闪烁检测器对土壤进行透射测量，以计算屏蔽参数，质量衰减系数，半值层和这些样品以压粉颗粒的形式具有十分之一的层值。已经发现这些重要参数的值随所研究的土壤样品的伽马射线能量和化学组成而变化。例如，质量衰减系数随着伽马射线能量的增加而降低，并且随着MgO和Na组分贡献的增加，吸收效果更好。还研究了压缩压力对衰减系数的影响，并通过高压力值对样品进行了更好的吸收。