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The marine geochemistry of actinium-227: Evidence for its migration through sediment pore water

Nozaki, Yoshiyuki ; Yamada, Masatoshi ; Nikaido, Hirofumi

Geophysical research letters, 1990-10, Vol.17 (11), p.1933-1936 [Periódico revisado por pares]

United States: Blackwell Publishing Ltd

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Título:
The marine geochemistry of actinium-227: Evidence for its migration through sediment pore water
Autor: Nozaki, Yoshiyuki ; Yamada, Masatoshi ; Nikaido, Hirofumi
Assuntos: 540311 - Environment, Aquatic- Basic Studies- Radiometric Techniques- (1990-) ; ACTINIDE ISOTOPES ; ACTINIDE NUCLEI ; ACTINIUM 227 ; ACTINIUM ISOTOPES ; ALKALINE EARTH ISOTOPES ; ALPHA DECAY RADIOISOTOPES ; BETA DECAY RADIOISOTOPES ; BETA-MINUS DECAY RADIOISOTOPES ; CHEMISTRY ; Deep sea ; Deep water ; DEPTH ; DIMENSIONS ; DISTRIBUTION ; ENVIRONMENTAL SCIENCES ; ENVIRONMENTAL TRANSPORT ; EVEN-EVEN NUCLEI ; GEOCHEMISTRY ; GEOLOGIC STRUCTURES ; Geophysics ; GROUND WATER ; Half life ; HEAVY NUCLEI ; HYDROGEN COMPOUNDS ; INTERNAL CONVERSION RADIOISOTOPES ; INTERSTITIAL WATER ; ISOTOPE APPLICATIONS ; ISOTOPES ; MASS TRANSFER ; MATHEMATICAL MODELS ; Migration ; NUCLEI ; ODD-EVEN NUCLEI ; OXYGEN COMPOUNDS ; PACIFIC OCEAN ; Porosity ; RADIOISOTOPES ; RADIONUCLIDE MIGRATION ; RADIUM 228 ; RADIUM ISOTOPES ; SEA BED ; SEAS ; SEDIMENTS ; SURFACE WATERS ; TRACER TECHNIQUES ; WATER ; WATER CHEMISTRY ; Water circulation ; YEARS LIVING RADIOISOTOPES
É parte de: Geophysical research letters, 1990-10, Vol.17 (11), p.1933-1936
Notas: ark:/67375/WNG-34BTJG1K-G
ArticleID:90GL01970
istex:8B63D19657815B71688DEA1B5FB74652C474919B
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: 227Ac with a half life of 21.8 years has a potential utility as a tracer of deep water circulation and mixing studies on time scales less than 100 years. Here we present the first measurement of 227Ac profile in the pore water of Northwest Pacific deep‐sea sediment and in the ∼ 10,000 m long water column of Izu‐Ogasawara Trench. The results clearly show that 227Ac is supplied from the sediment to the overlying water through migration in the pore water. The model calculation indicates that the molecular diffusion alone through sediment porewater can support only a half of the standing crop of excess 227Ac in the water column and the enhanced supply of 227Ac by particle mixing is necessary to account for the remainder. Thus, bioturbation in the deep sea plays an important role in controlling the flux of some short‐lived radionuclides such as 227Ac and 228Ra across the sediment‐water interface.
Editor: United States: Blackwell Publishing Ltd
Idioma: Inglês

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The marine geochemistry of actinium-227: Evidence for its migration through sediment pore water

Nozaki, Yoshiyuki ; Yamada, Masatoshi ; Nikaido, Hirofumi

United States: Blackwell Publishing Ltd

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