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Development and validation of a technique for the determination of 226Ra and 228Ra by liquid scintillation in liquid samples.

Abstract：

:Radium isotopes are dispersed in the environment according to their physicochemical characteristics. Considering their long half-lives and radiological effects, (226)Ra and (228)Ra are very important issues in radiological protection. In Brazil, radium isotopes represent an exposure problem both in nuclear fuel cycle installations and in high natural radiation background areas. The experimental part of this work includes the development of a technique for the determination of (226)Ra and (228)Ra by liquid scintillation with potential application in biological samples. Radium was concentrated and then separated from other constituents of the sample by co-precipitation/precipitation with Ba(Ra)SO(4). The precipitate was filtered and weighted to calculate the chemical yield. The filter containing the precipitate of Ba(Ra)SO(4) was transferred to a scintillation vial. Two methods were used to prepare the sources. The first one consisted of the addition of water (8 ml), Instagel XF (8 ml) and UltimaGold (4 ml) in the vial containing the filter and the precipitate, forming a gel suspension. In the second method, the precipitate was dissolved with 0.2 M ethylene-diamine-tetra-acetic-acid solution (9 ml) and 11 ml of scintillation solution (Optiphase Hisafe 3) was added to the vial, forming an aqueous and an organic phase. The solutions obtained were counted in a low background scintillation spectrometry system (Quantulus) suitable for the detection and identification of both alpha and beta particles for the determination of (226)Ra and (228)Ra. The activity values of (226)Ra and (228)Ra calculated by the two methods are in good agreement with the reference values, indicating that both methods are suitable for the determination of (226)Ra and (228)Ra.

journal_name

Radiat Prot Dosimetry

journal_title

Radiation protection dosimetry

authors

Fernandes PC,Sousa WO,Julião LM,Dantas BM

doi

10.1093/rpd/ncq434

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

335-8

issue

1-4

eissn

0144-8420

issn

1742-3406

pii

ncq434

journal_volume

144

pub_type

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Development and validation of a technique for the determination of 226Ra and 228Ra by liquid scintillation in liquid samples.