[en]137Cs, produced as a by-product of the atmospheric testing of thermonuclear weapons during the period extending from the 1950s to the 1970s, was distributed globally within the stratosphere and deposited as wet and/or dry fallout. The last great amount of radioactive caesium was deposited on the earth surface after Chernobyl accident. Significant variations in caesium activity levels in soils are caused by Chernobyl-derived fallout with relatively short period of contamination and great variabilities in activity and/or quantity of rainfall. However, total weapon testing-derived caesium pollution can be treated as generally uniform, i.e., numerous events over an extended period that minimise any local variation. Meanwhile, caesium, as well as the other radionuclides that behave like cations, can be moved upward by plant's uptake depending on various factors: plant species, sorption and desorption processes in soil, mineral soil composition, grain size and soil types, lateral caesium migration, etc. Certain plant species are known as caesium pollution indicators, but the uptake by an individual plant can be very different
Primary SubjectENVIRONMENTAL SCIENCES (C5223)
Secondary SubjectGEOSCIENCES (B3140)
Source/ReportEuropean Commission (CEC), Brussels (Belgium); International Atomic Energy Agency, Vienna (Austria); World Health Organization, Geneva (Switzerland); 699 p; ISSN 1011-4289; ; Sep 1997; p. 54-61; International conference on one decade after Chernobyl: Summing up the consequences of the accident; Vienna (Austria); 8-12 Apr 1996; 20 refs, 7 tabs.
Country/OrganizationInternational Atomic Energy Agency (IAEA)
Descriptors (DEI)BIOLOGICAL INDICATORS, CESIUM 137, CHERNOBYLSK-4 REACTOR, ENVIRONMENTAL IMPACTS, FALLOUT DEPOSITS, HONEY, RADIATION MONITORING, RADIOACTIVITY, REACTOR ACCIDENTS, SOILS
Descriptors (DEC)ACCIDENTS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CESIUM ISOTOPES, ENRICHED URANIUM REACTORS, FALLOUT, FOOD, GRAPHITE MODERATED REACTORS, INTERMEDIATE MASS NUCLEI, ISOTOPES, LWGR TYPE REACTORS, MONITORING, NUCLEI, ODD-EVEN NUCLEI, POWER REACTORS, RADIOISOTOPES, REACTORS, THERMAL REACTORS, WATER COOLED REACTORS, YEARS LIVING RADIOISOTOPES