Nom du corpus

Corpus Systématique Animale

Titre du document

Two new methods of determining radon diffusion in fish otoliths

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Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Poissons_v2b_001336
Auteur(s)
  • N. E. Whitehead 1
  • R. G. Ditchburn 1
Affiliation(s)
  • 1) Nuclear Sciences Group, Institute of Geological and Nuclear Sciences, P.O. Box 31-312, Lower Hutt, (New Zealand)
Résumé

Otoliths are bony structures found in the ears of fish and used in the210Pb/226Ra dating method for age determination. This paper checks the assumption that222Rn is not lost from or added to orange roughy fish otoliths by diffusion, which would invalidate the technique. The first method of monitoring diffusion relies on measuring the gamma activity of daughter radionuclides. Otoliths were exposed to an atmosphere enriched in222Rn for 10 days, and the supported gamma activity inside them measured allowing for various decay corrections. The calculated radon addition was (0.5±0.5)% of the activity of the226Ra present. The second method used an alpha spectrometer and attempted to detect222Rn directly outgased from otoliths in the detector vacuum chamber. The results were consistent within errors with those of the first method and showed no loss or gain of222Rn, supporting previous estimates of a long life-span for the orange roughy. In contrast it was found that approximately 10% of222Rn formed in orange roughy fish scales was lost to an evacuated environment, (hence perhaps to an aqueous environment) and that for this species it could be difficult to base a dating method on analysis of scales. Nevertheless a preliminary minimum age of 57 years was obtained. The methods could be used with non-biological samples to determine222Rn diffusion rates.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - chemistry
  • 3 - inorganic & nuclear chemistry
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - vertebres: anatomie et physiologie, organisme dans son ensemble ou etude de plusieurs organes ou systemes
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Health, Toxicology and Mutagenesis
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Public Health, Environmental and Occupational Health
  • 1 - Physical Sciences ; 2 - Chemistry ; 3 - Spectroscopy
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Pollution
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Radiology Nuclear Medicine and imaging
  • 1 - Physical Sciences ; 2 - Energy ; 3 - Nuclear Energy and Engineering
  • 1 - Physical Sciences ; 2 - Chemistry ; 3 - Analytical Chemistry
Catégories WoS
  • 1 - science ; 2 - nuclear science & technology
  • 1 - science ; 2 - chemistry, inorganic & nuclear
  • 1 - science ; 2 - chemistry, analytical
Identifiant ISTEX
33478F0E53A0CD92DF5535A7E959BB0365F69264
Revue

Journal of Radioanalytical and Nuclear Chemistry

Année de publication
1995
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
7.95
Sous-corpus
  • Poissons
Type de publication
Journal
ark:/67375/1BB-22DS24G0-X
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