<div><p>Samples for this dataset were collected as push cores using the HOV Alvin submersible. Analytical methods for measuring particulate Ra-224 and Th-228 are based on methods described in Cai et al. (2012; 2014). In short, once the cores were recovered on the ship, overlying waters were siphoned off and the sediment cores were sectioned in 2 cm vertical intervals for the top 10 cm, then 4 cm intervals for the remainder of the core. A slurry was prepared by adding ~¼ of the sediment volume (or ~1/8 of the sediment volume for the 4 cm intervals) to 150 mL of Ra-free tap water. The pH of the slurry was adjusted by adding 5-10 drops of concentrated NH3-OH, after which 1 mL of 19 mM KMnO4 and 1 mL of 40 mM MnCl2 solutions were added to precipitate any dissolved radium and thorium. A portion of this slurry was vacuum-filtered onto pre-weighed 47 mm diameter GFF filters until no further drops passed through the filter. Filters were dried in a drying oven (at 60 °C) for 12 hours, then placed is a filter holder within a cartridge and counted on a Radium Delayed Coincidence Counter (Moore and Arnold, 1996). Results from this analysis represent particulate Ra-224 activities. Filters were then measured on the Radium Delayed Coincidence Counter again after 3 weeks, from which the results are representative of Th-228 activities on the sediments.</p></div>
This dataset presents sedimentary radium isotope activities around Guaymas Basin
<div><p>This dataset presents sedimentary radium isotope activities around Guaymas Basin.</p></div>
Guaymas Sedimentary Radium AT37-06
<div><p>BCO-DMO Processing:<br />
- modified parameter names (changed hyphens to underscores; replaced spaces with underscores);<br />
- formatted date/time to ISO 8601 format;<br />
- corrected rows with value of "2019" as the year (changed to "2016");<br />
- saved Radium Delayed Coincidence Counter calibrations as PDF - see Supplemental Files.</p></div>
782858
Guaymas Sedimentary Radium AT37-06
2019-11-25T15:57:28-05:00
2019-11-25T15:57:28-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:782858
Sedimentary radium isotope activity around Guaymas Basin from samples collected by HOV Alvin during R/V Atlantis cruise AT37-06 in December 2016
This dataset presents sedimentary radium isotope activities around Guaymas Basin.
false
Peterson, R. (2019) Sedimentary radium isotope activity around Guaymas Basin from samples collected by HOV Alvin during R/V Atlantis cruise AT37-06 in December 2016. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-11-25 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.782858.1 [access date]
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