Dataset: FK190211 Radium Isotopes
Deployment: FK190211

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/924638

Co-Principal Investigator:

Richard N. Peterson (Coastal Carolina University)

Contact:

Richard N. Peterson (Coastal Carolina University)

Project:

Collaborative Research: Microbial Carbon cycling and its interactions with Sulfur and Nitrogen transformations in Guaymas Basin hydrothermal sediments (Guaymas Basin Interactions)

Version:

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Description

Methods & Sampling

Dataset acquisition description

Water samples for radium isotope analysis were collected from both niskin bottles attached to the CTD rosette (‘C’ designator in data sheet) and from niskin bottles attached to the remotely operated vehicle (ROV). Water samples were filtered through 47 mm GFF filters (unless otherwise noted), then passed slowly through 25 g (dry) acrylic fibers impregnated with MnO2 (Moore, 1976). Fibers were then washed 10x with Ra-free freshwater to remove salts and dried to a mass between 35 and 57 g for optimal humidity levels (Sun and Torgersen, 1998). Fibers were then immediately counted on a Radium Delayed Coincidence Counter (RaDeCC; Moore and Arnold, 1996) for total Ra-224 and Ra-223. Roughly 3 weeks later, fibers were counted again for supported Ra-224. Thus, excess (‘XS’) Ra-224 is the difference between total and supported Ra-224 measurements.

Radium isotopes were analyzed with a Radium Delayed Coincidence Counter (Moore and Arnold, 1996). This system was calibrated to standard MnO2 prepared from NIST-traceable solutions of Th-232 and Ac-227 (with daughters in equilibrium).

Data Processing Description

Dataset Processing Description

Data processing was performed in Microsoft Excel.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1357360	NSF Division of Ocean Sciences

Instruments

Niskin bottle

Supplied Description:

Both niskin bottles attached to the CTD rosette (‘C’ designator in data sheet) and from niskin bottles attached to the remotely operated vehicle (ROV) were used to collect samples.

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Radium Delayed Coincidence Counter

Supplied Name: Radium Delayed Coincidence Counter (Moore and Arnold, 1996)

Supplied Description:

Radium Delayed Coincidence Counter (Moore and Arnold, 1996). This system was calibrated to standard MnO2 prepared from NIST-traceable solutions of Th-232 and Ac-227 (with daughters in equilibrium).

Instrument Type

Generic Name: Radium Delayed Coincidence Counter

Acronym: RaDeCC

Generic Description:

The RaDeCC is an alpha scintillation counter that distinguishes decay events of short-lived radium daughter products based on their contrasting half-lives. This system was pioneered by Giffin et al. (1963) and adapted for radium measurements by Moore and Arnold (1996).

References:
Giffin, C., A. Kaufman, W.S. Broecker (1963). Delayed coincidence counter for the assay of actinon and thoron. J. Geophys. Res., 68, pp. 1749-1757.
Moore, W.S., R. Arnold (1996). Measurement of 223Ra and 224Ra in coastal waters using a delayed coincidence counter. J. Geophys. Res., 101 (1996), pp. 1321-1329.
Charette, Matthew A.; Dulaiova, Henrieta; Gonneea, Meagan E.; Henderson, Paul B.; Moore, Willard S.; Scholten, Jan C.; Pham, M. K. (2012). GEOTRACES radium isotopes interlaboratory comparison experiment. Limnology and Oceanography - Methods, vol 10, pg 451.

ROV SuBastian

Supplied Name: ROV

Supplied Description:

Water samples for radium isotope analysis were collected from niskin bottles attached to the remotely operated vehicle (ROV).

Instrument Type

Generic Name: ROV SuBastian

Generic Description:

ROV SuBastian is operated from the research vessel Falkor and the R/V Falkor(too). The ROV is outfitted with a suite of sensors and scientific equipment to support scientific data and sample collection, as well as interactive research, experimentation, and technology development. More information available at https://schmidtocean.org/technology/robotic-platforms/4500-m-remotely-operated-vehicle-rov/

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
C_or_R	CTD or ROV Niskin sample designator	unitless	sample
Station	Station #	unitless	station
Site	Site Name	unitless	site
Date	Local date (EST) sample collected	unitless	date_local
Time	Local time (EST) sample collected	unitless	time_local
Latitude	Sampling latitude	decimal degrees	lat
Longitude	Sampling longitude	decimal degrees	lon
Depth	Water depth of sample collection	meters (m)	depth
Sample_Volume	Water sample volume	Liters (l)	sample_volume
Ra223_Activity	Radium-223 activity. Note, minimum detectable activities (dpm/100L) are calculated based on Currie (1968). Any measured values lower than the minimum detectable activity is labeled ‘BD’.	disintegrations per minute per 100 Liters (dpm/100L)	Ra223
Ra223_Activity_Comment	Radium-223 activity comment field where BD = below detection	unitless	comment
Ra223_Unc	1-s analytical uncertainty for Ra223. Any value corresponding to measured values lower than the minimum detectable activity is labeled ‘BD’.	disintegrations per minute per 100 Liters (dpm/100L)	Ra223
Ra223_Unc_Comment	1-s analytical uncertainty for Ra223 comment field where BD = below detection	unitless	comment
XS_Ra224_Activity	Excess radium-224 activity. Note, minimum detectable activities (dpm/100L) are calculated based on Currie (1968). Any measured value lower than the minimum detectable activity is labeled ‘BD’.	disintegrations per minute per 100 Liters (dpm/100L)	Ra224
XS_Ra224_Activity_Comment	Excess radium-224 activity comment field where BD = below detection	unitless	comment
XS_Ra224_Unc	1-s analytical uncertainty for Ra224	disintegrations per minute per 100 Liters (dpm/100L)	Ra224
XS_Ra224_Unc_Comment	1-s analytical uncertainty for Ra225 comment field where BD = below detection	unitless	comment
ISO_DateTime_UTC	Sample date and time in ISO standardized format added by repository	unitless	ISO_DateTime_UTC

Database

Contribute Data

Dataset: FK190211 Radium Isotopes
Deployment: FK190211

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: FK190211 Radium IsotopesDeployment: FK190211

Dataset acquisition description

Dataset Processing Description

Dataset: FK190211 Radium Isotopes
Deployment: FK190211