A beta-alpha coincidence counting system for measurement of trace quantities of 238U and 232Th in aqueous samples at the Sudbury Neutrino Observatory

Dawson, M. and Doucas, G. and Fergani, H. and Jelley, N. A. and Majerus, S. and O'Keeffe, Helen Mary and Peeters, S. J. M. and Perry, C. (2016) A beta-alpha coincidence counting system for measurement of trace quantities of 238U and 232Th in aqueous samples at the Sudbury Neutrino Observatory. Journal of Instrumentation, 11 (8). ISSN 1748-0221

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Abstract

The Sudbury Neutrino Observatory experiment was built to measure the total flux of 8B solar neutrinos via the neutral current disintegration deuterium nuclei. This process can be mimiced by daughter isotopes of 232Th and 238U which can photodisintegrate the deuterium nucleus. Measurement of the concentration of such radioisotopes in the heavy water was critical to the success of the experiment. A radium assay technique using Hydrous Titanium Oxide coated filters was developed for this purpose and it was used in conjunction with a delayed beta-alpha coincidence counting system. The design, calibration and operation of this counting system are described in this paper. The counting efficiency for 232Th (224Ra) and 238U (226Ra) were measured to be 50 ± 5% and 62 ± 7%

Item Type: Journal Article
Journal or Publication Title: Journal of Instrumentation
Additional Information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2600/2610
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 81405
Deposited By: ep_importer_pure
Deposited On: 14 Sep 2016 09:38
Refereed?: Yes
Published?: Published
Last Modified: 23 Oct 2019 01:40
URI: https://eprints.lancs.ac.uk/id/eprint/81405

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