[en]After the reactor accident in Chernobyl radionuclides carried by airstreams reached Finland on April 27, 1986. The radioactive cloud spread over central and southern Finland and to a lesser extent over northern Finland. In Helsinki the maximum radionuclide concentrations in air were measured in late evening of April 28. The radioactive cloud remained over Finland only a short time and within a few days the radionuclide concentrations in the air decreased to one-hundredth of the maximum values. Most radionuclides causing deposition were washed down by local showers, resulting in very uneven deposition of radionuclides on the ground. In a addition minor amounts of radioactivity were deposited on Mav 10-12. For internal and external dose estimations Finland was divided into five fallout regions (1-5) according to the increasing 137Cs surface activity. At first, the short-lived radionuclides as well as 134Cs and 137Cs contributed to the external dose rate. Only the long-lived isotopes, 134Cs and especially 137Cs, later determined the external dose rates. The regions and corresponding dose rates and deposition categories on October 1, 1987, are shown.To estimate the total dose of the Finnish population from the radionuclides originating at Chernobyl the effective external and internal doses were calculated; the external doses were estimated using the data given. Groups of Finnish people representing the five fallout regions were whole-body counted annually during 1986-1990. The results of these measurements and those of the reference group were used to estimate the internal body burdens and radiation doses from 134Cs and 137Cs to the population
Primary SubjectRADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS (C2110)
Secondary SubjectRADIATION PROTECTION AND DOSIMETRY (C5500), SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS (C5100)
SourceEuropean Commission (CEC), Brussels (Belgium); International Atomic Energy Agency, Vienna (Austria); World Health Organization, Geneva (Switzerland); 699 p; ISSN 1011-4289; ; Sep 1997; p. 197-204; International conference on one decade after Chernobyl: Summing up the consequences of the accident; Vienna (Austria); 8-12 Apr 1996; 17 refs, 3 figs, 1 tab.
Country/OrganizationInternational Atomic Energy Agency (IAEA)
Descriptors (DEI)CESIUM 134, CESIUM 137, CHERNOBYLSK-4 REACTOR, ENVIRONMENTAL EXPOSURE, FINLAND, HUMAN POPULATIONS, INTERNAL IRRADIATION, IODINE 131, RADIATION DOSES, RADIONUCLIDE KINETICS, REACTOR ACCIDENTS, STRONTIUM 90, WHOLE-BODY COUNTING
Descriptors (DEC)ACCIDENTS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CESIUM ISOTOPES, COUNTING TECHNIQUES, DAYS LIVING RADIOISOTOPES, DEVELOPED COUNTRIES, ELECTRON CAPTURE RADIOISOTOPES, ENRICHED URANIUM REACTORS, EUROPE, EVEN-EVEN NUCLEI, GRAPHITE MODERATED REACTORS, HOURS LIVING RADIOISOTOPES, INTERMEDIATE MASS NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, IODINE ISOTOPES, IRRADIATION, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, KINETICS, LWGR TYPE REACTORS, NUCLEI, ODD-EVEN NUCLEI, ODD-ODD NUCLEI, POPULATIONS, POWER REACTORS, RADIOISOTOPES, REACTORS, SCANDINAVIA, STRONTIUM ISOTOPES, THERMAL REACTORS, WATER COOLED REACTORS, WESTERN EUROPE, YEARS LIVING RADIOISOTOPES