Radium isotopes in sub-Arctic waters

Details Radium isotopes in sub-Arctic waters Radium isotopes in sub-Arctic waters

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..329m&link_type=abstract

Earth and Planetary Science Letters, Volume 49, Issue 2, p. 329-340.

Physics

2

Scientific paper

Measurements of the 228Ra/226Ra activity ratio in the waters of the Greenland, Norwegian and Labrador Seas and Baffin Bay reveal strong horizontal gradients in the surface waters. The coastal waters are dominated by 228Ra injection from nearshore sediments. There is an inverse correlation between the 228Ra/226Ra activity ratio and salinity in the 30-36‰ salinity range. Vertical profiles indicate that the 228Ra/226Ra activity ratio is also strongly coupled to σθ except for some regions where 228Ra is being injected into higher density water as these isopycnals intersect coastal areas. We use these measurements in the area of formation of North Atlantic Deep Water to estimate that this water mass forms with a 228Ra/226Ra activity ratio of 0.10.

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