title: Evaluation of procedures for (226)Ra determination in samples with high barium concentration by α-particle spectrometry.
abstract: The γ emitter (133)Ba is the most often used tracer in determination of (226)Ra by α-particle spectrometry. If the source for α-particle spectrometry is prepared by microcoprecipitation, a high Ba concentration causes a thicker source layer which results in reduced counting efficiency due to self-absorption on the α spectrometer and consequently lower result for (226)Ra, while not effecting the measurement of (133)Ba in γ-ray spectrometry. If the electrodeposition is used, recoveries of deposited Ra and Ba are not necessarily the same and impurities of other α emitters may interfere with the α spectrum.
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. Electronic address: ljudmila.benedik@ijs.si.
authors.forename: L
authors.initials: L
authors.lastname: Benedik
keywords: Electrodeposition; Microcoprecipitation; Ra-226, Ra-225, Ba-133 and Th-229; Radiochemical separation; α-particle spectrometry; γ-ray spectrometry