Download Vertical mixing constrained with actinium: Example from D357 (St.11)

Deep-sea mixing along 40oS as seen in
radium isotopes and actinium
Walter Geibert, Alan Hsieh, Raja Ganeshram, Gideon M Henderson
Vertical mixing constrained with
actinium: Example from D357 (St.11)
Actinium Profiles from 40 S
Actinium and mixing in the South Atlantic
W
E
A new method to determine
226Ra in water
Comparison of new method with traditional ϒ-spectrometry
Valenti Rodellas- UA Barcelona (on Thursday)
signal on RadeCC
226Ra [dpm]
Very cheap and simple method to determine 226Ra in water
Summary
• Final measurement still stands out (planned for OctoberNovember)
• Preliminary data show vertical mixing in the lower
1000m between ~0.5 and 10 cm2/s
• Data point to an additional source and lateral mixing in
~3000-3500 m- Other data?
• Evaluation has resulted a very promising method to
measure 226Ra with a simple counting system.