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Interception and Retention of Chernobyl-derived 134-Cs, 137Cs and 106Ru in a Spruce Stand.
Sci. Total Environ. 78, 77-87 (1989)
The time dependence of the specific activity of Chernobyl-derived 134Cs, 137Cs and 106Ru was determined in vegetation and soil samples from an old spruce stand within a period of 600 days after the beginning of the radioactive fallout. The results show that 70% of the total activity of radiocesium and 60% of radioruthenium deposited in the spruce stand were retained intinially in the canopy. They were removed from the needles and twigs as a result of weathering (rain, wind, litter fall) and transferred to the forest floor, but only rather slowly (half-lives in the canopy: radiocesium, 90 days for the period 0–130 days, 230 days for the period 130–600 days; radioruthenium, 95 days for the period 0–200 days). The transfer of radiocesium and ruthenium to the forest floor by litter-fall was small when compared with that of weathering by rain or wind (radiocesium 7%, radioruthenium 8%, with respect to the total activity deposited in the canopy). The total deposition of radiocesium and ruthenium in the spruce stand was higher by 20 and 24%, respectively, than that observed in nearby grassland. The deposition velocity of radiocesium in the spruce stand was estimated at 5.5 mm s−1, higher by a factor of 10 than the figure for grassland. Similar values were found for radioruthenium
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
ISSN (print) / ISBN 0048-9697
Zeitschrift Science of the Total Environment, The
Quellenangaben Band: 78, Seiten: 77-87
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Radiation Protection (ISS)