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Experimental analysis of the mass efficiency curve for gross alpha activity and morphological study of the residue obtained by the co-precipitation method

机译:总α活性的质量效率曲线的实验分析和共沉淀法获得的残留物的形态研究

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摘要

Gross alpha activity determination in drinking water is one of the radiological parameters that must be determined in order to decide whether further specific analyses of radionuclides in samples is required. This parameter can be determined by the co-precipitation method using a ZnS(Ag) scintillation detector or a proportional counter. The method consists of collecting all alpha emitters of interest using barium and iron as carriers as they provide more uniform and homogeneous residues than the evaporation method, especially for highly saline waters. In the course of our work, the efficiencies of the gas proportional and ZnS(Ag) detectors for alpha particle detection in water residues were studied in function of sample mass (precipitate) with residues ranging between 16.0 and 35.0mg. In addition, the structure and morphological composition of a residue collected by the co-precipitation method was studied with the aim of verifying whether the residue is a homogeneous mixture. The effect of alpha energy on the efficiency and stability of the calibration samples (mass and efficiency) was studied using 230Th, natural uranium ( natU) and 241Am radionuclides.
机译:饮用水中总α活度的测定是必须确定以确定是否需要对样品中放射性核素进行进一步具体分析的放射学参数之一。可以使用ZnS(Ag)闪烁检测器或比例计数器通过共沉淀法确定该参数。该方法包括使用钡和铁作为载体收集所有感兴趣的α发射体,因为与蒸发法相比,它们提供更均匀和均匀的残留物,特别是对于高盐度水。在我们的工作过程中,研究了气体比例检测器和ZnS(Ag)检测器在残留水中的α颗粒检测的效率与残留量在16.0至35.0mg之间的样品质量(沉淀)的函数关系。另外,研究了通过共沉淀法收集的残留物的结构和形态组成,以验证残留物是否为均匀混合物。使用230Th,天然铀(natU)和241Am放射性核素研究了α能量对校准样品的效率和稳定性(质量和效率)的影响。

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