Improvements in the radiochemical method for separating 226 Ra in solid samples through coprecipitation with BaSO 4 .

Autor: Suárez-Navarro JA; CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain. Electronic address: ja.suarez@ciemat.es., Expósito-Suárez VM; CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain., Crespo MT; CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain., Sánchez-Castaño B; Universidad Rey Juan Carlos, 28933, Móstoles, Madrid, Spain., Suárez-Navarro MJ; Universidad Politécnica de Madrid (UPM), E.T.S.I. Caminos, Canales y Puertos, Profesor Aranguren s/n, 28040, Madrid, Spain., Gascó C; CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain., Barragán M; CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain., Gascón JL; CIEMAT, Avenida Complutense 40, 28040, Madrid, Spain., Pecker R; Universidad Complutense de Madrid, 28040, Madrid, Spain., Sánchez-Pérez L; Universidad Complutense de Madrid, 28040, Madrid, Spain., González-Cano L; IES Virgen de la Paloma, 28039, Madrid, Spain., Rosario A; IES Virgen de la Paloma, 28039, Madrid, Spain.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2022 Sep; Vol. 187, pp. 110321. Date of Electronic Publication: 2022 Jun 16.
DOI: 10.1016/j.apradiso.2022.110321
Abstrakt: The aim of this work was to improve the commonly used method for 226 Ra determination in water and to establish its application in solid samples. This method is based on the coprecipitation of Ra with BaSO 4 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, 241 Am and 226 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 2+ ≫Fe 3+ >Mg 2+ ≈Ca 2+ >K + ≈Na + . The method was successfully applied to soil, sediment, and plant ash samples.
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Databáze: MEDLINE
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