Determination of Pb-210 and Po-210 in aqueous environmental samples Von der Naturwissenschaftlichen Fakultät der Gottfried Wilhelm Leibniz Universität Hannover zur Erlangung des Grades Doktor der Naturwissenschaften (Dr. rer. nat.) genehmigte Dissertation von M. SC. LENA YVONNE JOHANSSON geboren am 13. Oktober 1976 in Frändefors, Schweden 2008
210Pb Dating of Sediments 234U 238U 248ka 4.7Ga 63.3 53.2 210 Pb dating is a U/Th series disequilibrium method. It uses the fact that the noble gas 222 Rn escapes from sediments to the atmosphere and here decays to 210 Pb. The particle-reactive 210 Pb attaches to aerosols, is deposited, and can be used to date sediments in the anthropogenic time scale.
Lead–lead dating is a method for dating geological samples, normally based on whole-rock samples of material such as granite. For most dating requirements it has been superseded by uranium–lead dating (U–Pb dating), but in certain specialized situations (such as dating meteorites and the age of the Earth) it is more important than U–Pb dating.
For aquatic sediments, the use of 210 Pb originating from the decay of atmospheric 222 Rn is a well-established methodology to estimate sediment ages and sedimentation rates. Traditionally, the measurement of 210 Pb in soils and sediments involved laborious and time-consuming radiochemical separation procedures. Due to the recent development of advanced planar (‘n-type’) semi-conductors
Roughly fifty years ago, a small group of scientists from Belgium and the United States, trying to better constrain ice sheet accumulation rates, attempted to apply what was then know about environmental lead as a potential geochronometer. Thus Goldberg (1963) developed the first principles of the 210Pb dating method, which was soon followed by a paper by Crozaz et al. (1964), who examined
Het chemisch element lood (Pb), met een atoommassa van 207,2 u, bezit 4 stabiele isotopen: 204 Pb, 206 Pb, 207 Pb en 208 Pb, waarvan de laatste het meest abundant is (ongeveer 52,4%). De 33 radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd. In de natuur komen ook sporen van de radio-isotopen 210 Pb, 211 Pb, 212 Pb en 214 Pb voor.. De kortstlevende isotoop van lood is
Lead-210 and radium-226 measurements by direct gamma assay can now provide a record of changing concentrations in lake sediments sufficiently reliable and precise to form a suitable basis for age/depth and dry-sedimentation-rate calculations. There are additional benefits in terms of non destructive sample preparation and simultaneous assay for other environmentally significant gamma-emitting
210 Pb, a radioactive isotope in the 238 U decay chain, is continuously produced by the decay of atmospheric 222 Rn gas. The 210 Pb is transported in precipitation to the Earth’s surface where it adsorbs onto silicate particles, some of which become lacustrine sediment. This 210 Pb decays because it is unsupported by 226 Ra via 222 Rn. Therefore in undisturbed sediment that has been
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