A study on lead-210 dating

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Other Title
  • 鉛-210堆積年代測定法とその問題点
  • ナマリ 210 タイセキ ネンダイ ソクテイホウ ト ソノ モンダイテン

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Description

Lead-210 is one of the natural radionuclides belonging to the uranium series and has a halflife of 22.3 y. It has been used to measure sedimentation rates of lake and marine sediments. The calculations of ages are achieved on the basis of CRS model or CIC model depending on the source of Pb-210 fluxes. Surface sediments are disturbed and mixed by biological (bioturbation) and physical turbulence, and this process is incorporated into the model as a diffusion equation. The sedimentation process and mixing process cannot be distinguished by Pb-210 profiles, so much attention should be paid to the observation of cores. The profiles of other nuclides, anthropogenic elements and organics would help better understanding. Computers are often used for calculations and effective models are required for the estimation of the ancient sedimentary environment.

Journal

  • Chikyukagaku

    Chikyukagaku 34 (1), 23-39, 2000

    The Geochemical Society of Japan

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