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The determination of 234Th in marine samples using liquid scintillation spectrometry.

Pates, Jackie M. and Cook, Gordon T. and MacKenzie, Angus B. and Anderson, Robert and Bury, Sarah J. (1996) The determination of 234Th in marine samples using liquid scintillation spectrometry. Analytical Chemistry, 68 (21). pp. 3783-3788. ISSN 0003-2700

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Abstract

A liquid scintillation spectrometry method for the determination of 234Th in seawater with 230Th as the yield tracer has been developed and validated. 234Th is separated from the dissolved phase by an Fe(OH)3 precipitation and is then purified using ion exchange chromatography. The counting source is prepared by taking the sample to dryness in a vial, redissolving in acid, and mixing with a scintillation cocktail. The instrument employed has a relatively low background (11 cpm) and the ability to separate α from β activity on the basis of pulse shapes. The 234Th + 234mPa counting efficiency is 50% over the counting window employed. The limit of detection, using the above parameters, a 20 L sample, and a 400 min count is found to be 0.04 dpm L-1. It was also demonstrated that less advanced instruments, without α/β separation, can also be used effectively.

Item Type: Article
Journal or Publication Title: Analytical Chemistry
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 30724
Deposited By: Mr Richard Ingham
Deposited On: 02 Dec 2009 10:39
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:48
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/30724

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