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Deep-sea mixing along 40 o S as seen in radium isotopes and actinium

Deep-sea mixing along 40 o S 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 . E. W.

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Deep-sea mixing along 40 o S as seen in radium isotopes and actinium

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  1. Deep-sea mixing along 40oS as seen in radium isotopes and actinium Walter Geibert, Alan Hsieh, Raja Ganeshram, Gideon M Henderson

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

  3. Actinium Profiles from 40 S

  4. Actinium and mixing in the South Atlantic E W

  5. A new method to determine 226Ra in water

  6. Comparison of new method with traditional ϒ-spectrometry ValentiRodellas- UA Barcelona (on Thursday) signal on RadeCC 226Ra [dpm] Very cheap and simple method to determine 226Ra in water

  7. Summary • Final measurement still stands out (planned for October-November) • 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.

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