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2 2003

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Testing applicability of 210Pb method to date sediments of human-made lake Kozłowa Góra

Sikorski J., Bluszcz A.

Geochronometria

2003

Vol. 22

63-66

This paper presents results of measurements of 210Pb in sediments of the humanmade lake Kozłowa Góra. The measurements were done on the complete sediment cores taken in 1999 and covering the whole 60 years span of life of the lake. For the first time in Poland, the gamma ray spectrometry was employed, additionally to the alpha spectrometry method, what gave the opportunity to date the sediments and also to determine the sedimentation rates, and to correlate their changes with modification of the dam. Analyses of measured 210Pb radioactivity and dating based on a modified CRS model and led to a model of sedimentation that explains most of experimental results.

Inventory of sediments of the dammed lake in Kozłowa Góra and first measurements of 210Pb activities in the lake deposits

Sikorski J., Goslar T.

Geochronometria

2003

Vol. 22

55-62

The dammed lake Kozłowa Góra was created in 1939, and has been utilized as a fresh-water reservoir. The lake is situated in Upper Silesia. The paper describes this artificial water reservoir, its sediments, the probes used and the sediment cores collected for analyses of activities of 210Pb. The cores of sediments have been collected in 13 sites, 6 of them along the dam. Sediment cores were gained by the freezing method. 210Pb method has been widely used in dating of lake sediments. The activity of allochthonous 210Pb decreases according to the law of radioactive decay with the half-life of T˝ = 22.26 yr. Thus its activity can be used to determine the age of sediments within the range of several half-lives (100-150 years). Here we present preliminary 210Pb measurements in sediments of dammed lake Kozłowa Góra.