10-1088-1748-0221-11-08-P08013.pdf (322.95 kB)
A beta-alpha coincidence counting system for measurement of trace quantities of 238U and 232Th in aqueous samples at the Sudbury Neutrino Observatory
journal contribution
posted on 2023-06-09, 04:11 authored by M Dawson, G Doucas, H Fergani, N A Jelley, S Majerus, H M O'Keeffe, Simon PeetersSimon Peeters, C PerryThe 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 mimicked by daughter isotopes of 232Th and 238U which can photo-disintegrate 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%
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Publication status
- Published
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- Published version
Journal
Journal of InstrumentationISSN
1748-0221Publisher
IOP PublishingExternal DOI
Issue
08Volume
11Page range
08013Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Experimental Particle Physics Research Group Publications
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- Yes
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- Yes
Legacy Posted Date
2016-11-25First Open Access (FOA) Date
2016-11-25First Compliant Deposit (FCD) Date
2016-11-25Usage metrics
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