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M. Popijač, I. Seletković, M. Volner. I. Lovrenčić. D. Barišić, N. Kezić: DINAMIKA KRETANJA Šumarski list br. 5-6, CXXVII1 (2004). 269-277
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SUMMARY: Cesium 137, or l37Cs, appeared in the atmosphere after thermonuclear
tests were conducted intensively during the 1950´s and 1960´s,
and the last large quantity of!37Cs was released after the major explosion at
Chernobyl, when varying amounts of cesium deposits on the earth´s surface
were observed. Irradiation was relatively brief while levels of radioactivity
were not equal, because they were linked to the amount of precipitation that
appeared uncontrollably as a result of the explosion. Cesium very quickly
entered the soil, but it only migrated to deeper layers very slowly due to the
effects of surface waters (Filipović et al, 1991). The speed of cesium migration
was slowed by radiation absorption processes. A relatively large quantity
of clay and micro-minerals resulted in the fast and irreversible bonding of
cesium with the soil (Cremers et al, 1988).
Plant species are good indicators of cesium, even though their physiological
characteristics may vary. This primarily depends on the free cesium in the
root system that the plants have taken in from the soil and the extent of its penetration
into the plant. Today it is important to stress that the physiological
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