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Instrument: GM multicounter

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Description

A gas flow multicounter (GM multicounter) is used for counting low-level beta doses. GM multicounters can be used for gas proportional counting of 32Si to 32P. For more information about GM multicounter usage see Krause et. al. 2011.

Datasets (12)

Dataset Name	PI-Supplied Description	PI-Supplied Name
Silicon Uptake Kinetics sampled aboard the R/V Pelican during during PE17-04 and PE17-20 along the Northern Gulf of Mexico, specifically the Louisiana Shelf region dominated by the discharge of the Mississippi River plume.	Quantification of 32Si activity was done on a GM 25 Multicounters (Risø National Laboratory, Technical University of Denmark), each are configured to analyze five samples simultaneously. System setup includes an anti-coincidence module, which with considerable lead shielding reduces background activity to	GM 25 Multicounters (Risø National Laboratory, Technical University of Denmark)
Water column data sampled aboard the R/V Pelican during August and September 2016 and May 2017 in Northern Gulf of Mexico, specifically the Louisiana Shelf region dominated by the discharge of the Mississippi River plume.	Quantification of 32Si activity was done on a GM 25 Multicounters (Risø National Laboratory, Technical University of Denmark), each are configured to analyze five samples simultaneously. System setup includes an anti-coincidence module, which with considerable lead shielding reduces background activity to	GM 25 Multicounters (Risø National Laboratory, Technical University of Denmark)
Results from a laboratory-based investigation into sediment Silicon sorption capacities using standardized clay samples and the radioactive tracer 32Si		GM-24 Multicounter (Risø DTU National Laboratory, Denmark)
Sediment trap carbon, nitrogen, and isotope, pigment, and 234Th flux from deployments during R/V Nancy Foster cruises NF1704 and NF1802 in the Gulf of Maine in May of 2017 and 2018.		low-background RISO beta multi-counter
Particulate organic carbon, nitrogen, and Thorium-234 collected during the 2012-2013 Palmer Field Season (WAP Carbon export project)	Samples from six euphotic zone depths (surface to 65 meters) were counted in a RISO low-level beta multi-counter to determine the activity of 234Th.	Riso low-level GM beta multi-counter
Particulate organic carbon, nitrogen, and Thorium-234 measurements collected during the 2012-2013 Palmer Field Season (WAP Carbon export project)	Collected sediment trap samples were dried, mounted in RISO planchets and counted on a RISO low-level beta multi-counter.	Riso low-level GM beta multi-counter
Size Fractionated Particulate Thorium-234 measurements collected during the 2012-2013 Palmer Field Season	Collected sediment trap samples were dried, mounted in RISO planchets and counted on a RISO low-level beta multi-counter.	Riso low-level GM beta multi-counter
Total water column Thorium-234 measurements collected during the 2012-2013 Palmer Field Season (WAP Carbon export project)	Samples were then vacuum filtered at high vacuum pressure through a quartz (QMA) filter. Filters were mounted in RISO planchets and counted on a RISO low-level beta multi-counter at Palmer Station.	Riso low-level GM beta multi-counter
Water column particulate silica, standing stocks, and productivity rates from R/V Atlantic Explorer cruises AE1218, AE1228, AE1319, AE1322 in Bermuda, and NW Atlantic from 2012-2013 (Si_in_Syn project)	GM Multicounter (Riso National Laboratory, Technical University of Denmark).	GM Multicounter
Synechococcus cell silica uptake from cultures with added nutrients from laboratory experiments at the Dauphin Island Sea Lab between 2013 and 2015 (Si_in_Syn project)	GM 25-5 multicounters (Risø National Laboratory, Technical University of Denmark).	GM 25-5 multicounter
Synechococcus silica uptake rates from cultures with and without added orthophospate from laboratory experiments at the Dauphin Island Sea Lab from August of 2013 to September of 2014 (Si_in_Syn project)	Manufactured by Riso Laboratories	GM 25-5 multicounter
Silica uptake by Synechococcus cells in response to a gradient of silicic acid concentrations from lab experiments at Dauphin Island Sea Lab and University of Santa Barbara between 2012-2015 (Si_in_Syn project)	GM 25-5 multicounters (Risø National Laboratory, Technical University of Denmark)	GM 25-5 multicounter