CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain.
CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain.
Appl Radiat Isot. 2022 Sep;187:110321. doi: 10.1016/j.apradiso.2022.110321. Epub 2022 Jun 16.
The aim of this work was to improve the commonly used method for Ra determination in water and to establish its application in solid samples. This method is based on the coprecipitation of Ra with BaSO and gross alpha counting of the precipitate. An exhaustive study of the coprecipitation behaviour of the most abundant cations present in solid samples was performed to avoid incorrect radiochemical yields. As a result, it was considered necessary to introduce two new purification steps into the conventional method. Likewise, two nuclides, Am and Ra, were compared to obtain the mass efficiency curve given their different behaviour in the coprecipitation process. While Ra behaves similarly to Ba, Am coprecipitates, forming mixed crystals that may behave differently in the self-absorption process. The influence of the cations on the chemical yield with no precipitate purification was: Sr≫Fe>Mg≈Ca>K≈Na. The method was successfully applied to soil, sediment, and plant ash samples.
本工作旨在改进水中镭的常用测定方法，并将其应用于固体样品。该方法基于镭与硫酸钡共沉淀和沉淀物的总α计数。对固体样品中最丰富的阳离子的共沉淀行为进行了详尽的研究，以避免不正确的放射化学产率。因此，有必要在常规方法中引入两个新的纯化步骤。同样，为了获得由于在共沉淀过程中不同行为而给出的质量效率曲线，比较了两种核素 Am 和 Ra。虽然镭的行为与钡相似，但 Am 共沉淀，形成混合晶体，在自吸收过程中可能表现不同。阳离子对无沉淀纯化时化学产率的影响为：Sr≫Fe>Mg≈Ca>K≈Na。该方法成功应用于土壤、沉积物和植物灰样品。
