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dc.contributor.authorHartman, M. C.
dc.contributor.authorBuesseler, Ken O.
dc.date.accessioned2006-02-22T16:18:32Z
dc.date.available2006-02-22T16:18:32Z
dc.date.issued1994-07
dc.identifier.urihttp://hdl.handle.net/1912/589
dc.description.abstractTwo 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.sponsorshipFunding was provided by the National Oceanic and Atmospheric Administration Offce of Global Programs under Contract OCE-920395200.en
dc.format.extent897958 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherWoods Hole Oceanographic Institutionen
dc.relation.ispartofseriesWHOI Technical Reportsen
dc.relation.ispartofseriesWHOI-94-15en
dc.subjectThorium-234en
dc.subjectMn02 adsorberen
dc.subjectseawateren
dc.subjectCape Hatteras (Ship) Cruiseen
dc.subjectMalcolm Baldridge (Ship) Cruiseen
dc.subjectDiscoverer (Ship) Cruiseen
dc.titleAdsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawateren
dc.typeTechnical Reporten
dc.identifier.doi10.1575/1912/589


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