Naslov
DEPTH PROFILES OF 137Cs AND 14C IN LAKE SEDIMENTS FROM THE PLITVICE LAKES

Autori
Sironić, Andreja ; Horvatinčić, Nada ; Bikit, Istvan ; Todorović, Nataša ; Nikolov, Jovana ; Mrdja, Dušan ; Forkapić, Sofija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
RAD2012 - The First International Conference on Radiation and Dosimetry in Various Fields of Research - Book of Abstracts / Ristić, Goran - Niš : University of Niš, 2012, 108-108

ISBN
978-86-6125-062-0

Skup
RAD2012 - The First International Conference on Radiation and Dosimetry in Various Fields of Research

Mjesto i datum
Niš, Srbija, 25.04.2012. - 27.04.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
lake sediments; Plitvice Lakes; 14C; 137Cs

Sažetak
Radioactive isotopes 137Cs (half-life 30.2 yr) and 14C (half-life 5730 yr) are used as a suitable tool in a lake sediment study. 137Cs is an anthropogenic isotope introduced into the atmosphere by nuclear weapon tests in fifties and sixties in the last century and additionally in 1986 as Chernobyl fallout. 14C is basically of the natural origin, but significant 14C contamination of the atmospheric CO2 by nuclear weapon test also occurred with maximum in 1963. The anthropogenic contamination of the atmosphere by 137Cs and 14C was reflected in the lake sediments but with a different intensity response and with a certain time delay. The record of the 137Cs and 14C in recent carbonate sediments can be used to determine sedimentation rate as well as to follow environmental processes of carbon geochemistry. The distribution of 137Cs and 14C in the profile of the recent carbonate sediments (top 40 cm) was determined in lakes Kozjak and Prošće in the Plitvice Lakes National Park, Croatia. Frozen sediment cores, 40 cm long, were cut into 1- to 2-cm-thick layers and dried prior to analyses. Sediments consisted mainly of carbonate/calcite (80-90%) precipitated from the water. 14C activity was measured in carbonate and organic fraction using liquid scintillation counter technique with benzene synthesis method for carbonate fraction, and accelerator mass spectrometry technique with graphite synthesis for organic fraction. 137Cs activity was measured by gamma spectrometry method. The results of 137Cs and 14C activity distribution in sediment profile of lakes Kozjak and Prošće will be compared. Sedimentation rate in both lakes based on 137Cs will be determined and the response of the 14C activity in the lake sediments in carbonate and organic fraction caused by atmospheric CO2 contamination will be discussed. The work was performed within the project with Plitvice National Park, Bilateral scientific project between Croatia and Serbia, and EU FP7 SOWAEUMED project.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija

POVEZANOST RADA