Radium isotopes collected on R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)

<p>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.&nbsp;Samples were collected for Radium Isotopes ex223Ra (227Ac corrected), ex224Ra (228Th corrected), 226Ra, 228Ra, 228Th (particulate), 228Th (dissolved), and 228Th (total). <strong>Only 226Ra and 228Ra are reported in this version of the dataset.</strong> Future versions will include the other Ra isotopes and 228Th.</p>

<p><strong>Related files and references: </strong>&nbsp;<br />
Cartridge preparation:&nbsp;<br />
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:<a href=\"http://dx.doi.org/10.1007/s10967-012-2047-9\" target=\"_blank\">10.1007/s10967-012-2047-9</a>, 2012.</p>

<p>Particulate and dissolved 228Th determination:<br />
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:<a href=\"http://dx.doi.org/10.1016/j.marchem. 2014.12.001\" target=\"_blank\">10.1016/j.marchem. 2014.12.001</a>.&nbsp;</p>