Adsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawater


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dc.contributor.author Hartman, M. C.
dc.contributor.author Buesseler, Ken O.
dc.date.accessioned 2006-02-22T16:18:32Z
dc.date.available 2006-02-22T16:18:32Z
dc.date.issued 1994-07
dc.identifier.uri http://hdl.handle.net/1912/589
dc.description.abstract Two polypropylene cartridge types (Beta Pure and Hytrex II) were tested in the laboratory as adsorbers for in-situ collection of dissolved Thorium-234 (234TH) in seawater. Using a uranyl nitrate tracer, we determined that a Mn02 impregnated 3.25-inch Hytrex II cartridge with a flow rate of 8 liters/minute would collect 234TH with a greater than 60% effciency. The smaller size and composition of the 3.25 inch Hytrex II cartridge enabled it to be pressed into a permanent 1-inch "puck" for direct gamma counting. This protocol significantly reduced the handling between collection and counting. When field tested in the Gulf of Maine as a large volume (>500 liters) collector, the new adsorbers produced a greater than 80% collection effciency and a dissolved 234TH concentration which was consistent with independent samples collected at the same station and depth. These adsorbers were used successfully for the in-situ collection of 234TH in large volumes of seawater during the 1992 NOAA and NSF sponsored JGOFS EqPac program, with a mean collection efficiency of 0.79 +/- 9% (n=104 cartridge pairs). en
dc.description.sponsorship Funding was provided by the National Oceanic and Atmospheric Administration Offce of Global Programs under Contract OCE-920395200. en
dc.format.extent 897958 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Woods Hole Oceanographic Institution en
dc.relation.ispartofseries WHOI Technical Reports en
dc.relation.ispartofseries WHOI-94-15 en
dc.subject Thorium-234 en
dc.subject Mn02 adsorber en
dc.subject seawater en
dc.title Adsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawater en
dc.type Technical Report en
dc.identifier.doi 10.1575/1912/589

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