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Bibliographic record number: 373009

Journal

Authors: Marović, Gordana; Franić, Zdenko; Senčar, Jasminka
Title: Mahovina u radiološkom monitoringu
Source: Zbornik radova VII. simpozija Hrvatskog društva za zaštitu od zračenja s međunarodnim sudjelovanjem / Barišić, Delko ; Grahek, Željko ; Krajcar Bronić, Ines ; Miljanić, Saveta (ed). - Zagreb, Hrvatska : HDZZ-CRPA , 2008. 230-235 (ISBN: 978-953-96133-6-3).
Meeting: VII. simpozij Hrvatskog društva za zaštitu od zračenja s međunarodnim sudjelovanjem
Location and date: Opatija, Hrvatska, 29-31.05.2008.
Keywords: radioaktivnost; 137Cs; ekološko vrijeme poluraspada; mahovine
Abstract:
Mosses, lichens and perennial plants, all characterized by slow growth, are able to efficiently accumulate different radionuclides from their environment to a much higher degree than other vegetation. Consequently, they are sensitive bioindicators of radioactive contamination for various ecosystems. Results of systematic, long-term measurements of 137Cs activities in mosses for the period 1986-2007 are summarized. The study was conducted in the Radiation Protection Unit of the Institute for Medical Research and Occupational Health in Zagreb, as a part of an extensive monitoring program of the Croatian environment. In the overall observed period the highest activity concentration of 137Cs deposited by fallout has been recorded in 1986, which is the year of Chernobyl accident, causing peak 137Cs activity concentration in moss of 8800 Bqkg-1 in May 1986. Mean value for period 1986-1990 was 3423 Bqkg-1. For comparison, in the same period mean 137Cs activity concentration in grass was 390 Bqkg-1. In 1990s, ten year after Chornobyl accident, mean 137Cs activity concentration in moss was 1345 Bqkg-1, with maximum value of 3940 Bqkg-1 (December 1994). In 2000s, mean 137Cs activity concentration in mosses was 172 Bqkg-1 with maximum value of 955 Bqkg-1 (July 2002). Fitting the measured 137Cs activity concentrations to the theoretical curve (1) the ecological half-life of 137Cs in moss was found to be about 978 days, while in grass was found to be about 126 days in the period 1986-1990. The ecological half-life of 137Cs in grass after 1991 was found to be about 2503 days. The ecological half-life of 137Cs in moss is about eight times higher than 137Cs ecological half-life observed in grass in the first period after the Chernobyl accident.
Type of meeting: Predavanje
Type of presentation in a journal: Other
Type of peer-review: Domestic peer-review
Project / theme: 022-0222882-2335, 022-0222882-2823
Original language: ENG
Category: Znanstveni
Research fields:
Physics,Public health and health care system
Contrib. to CROSBI by: jsencar@imi.hr (jsencar@imi.hr), 25. Stu. 2008. u 15:52 sati



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