Radium and Thorium isotopes were collected on manganese oxide impregnated cartridges using an in situ pump filtering 1500-2000L at depth, while ~1000L surface samples were collected by hanging manganese oxide impregnated acrylic fibers over the side of the ship. Samples were collected for Radium Isotopes ex223Ra (227Ac corrected), ex224Ra (228Th corrected), 226Ra, 228Ra, 228Th (particulate), 228Th (dissolved), and 228Th (total). Only 226Ra and 228Ra are reported in this version of the dataset. Future versions will include the other Ra isotopes and 228Th.
Related files and references:
Cartridge preparation:
Henderson, P. B., Morris, P. J., Moore, W. S., and Charette, M. A.: Methodological advances for measuring low-level radium isotopes in seawater, J. Radioanal. Nucl. Chem., 293, 1–6, doi:10.1007/s10967-012-2047-9, 2012.
Particulate and dissolved 228Th determination:
Maiti, K., Charette, M.A., Buesseler, K.O., Zhou, K., Henderson, P., Moore, W.S., Morris, P., Kipp, L., 2015. Determination of particulate and dissolved 228Th in seawater using a delayed coincidence counter. Mar. Chem. doi:10.1016/j.marchem. 2014.12.001.
Charette, M. A., Moore, W. S. (2016) Radium isotopes collected on R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 29 June 2016) Version Date 2016-06-29 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/650340 [access date]
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