A radium assay technique using hydrous titanium oxide adsorbent for the Sudbury Neutrino Observatory

Details A radium assay technique using hydrous titanium oxide adsorbent for the Sudbury Neutrino Observatory A radium assay technique using hydrous titanium oxide adsorbent for the Sudbury Neutrino Observatory

2002-08-26

arxiv.org/abs/nucl-ex/0208015v1

Nucl.Instrum.Meth. A501 (2003) 386-398

Physics

Nuclear Physics

Nuclear Experiment

12 pages, 4 figures

Scientific paper

10.1016/S0168-9002(02)01925-3

As photodisintegration of deuterons mimics the disintegration of deuterons by neutrinos, the accurate measurement of the radioactivity from thorium and uranium decay chains in the heavy water in the Sudbury Neutrino Observatory (SNO) is essential for the determination of the total solar neutrino flux. A radium assay technique of the required sensitivity is described that uses hydrous titanium oxide adsorbent on a filtration membrane together with a beta-alpha delayed coincidence counting system. For a 200 tonne assay the detection limit for 232Th is a concentration of 3 x 10^(-16) g Th/g water and for 238U of 3 x 10^(-16) g U/g water. Results of assays of both the heavy and light water carried out during the first two years of data collection of SNO are presented.

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