title: The measurement of low concentrations of Kr-85 in atmospheric air samples.
abstract: Krypton-85 atmospheric contamination produced by the nuclear industry has been investigated on the basis of regular measurements. 85Kr concentrations observed in ground-level air of Prague between 1983 and 1993 are presented and their time-related changes analyzed. The long-term trend of 85Kr activity increased steadily over the monitored period with the growth rate of 38 mBq.m-3 (STP)/yr and reached about 1.2 Bq.m-3 (STP) in 1992. Short-term variations of the baseline level with the average amplitude of 12% show a seasonal periodicity. Occasionally detected extreme values of up to 2.5 Bq.m-3 (STP) indicate undispersed emissions from distant nuclear fuel reprocessing plants.
authors.affiliation: Institute of Radiation Dosimetry, Czech Academy of Sciences, Prague.
authors.forename: L
authors.initials: L
authors.lastname: Wilhelmová
authors.forename: M
authors.initials: M
authors.lastname: Tomásek
authors.forename: K
authors.initials: K
authors.lastname: Stukheil
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D002850:Chromatography, Gel; D008401:Gas Chromatography-Mass Spectrometry; D007727:Krypton Radioisotopes / Q000032:analysis*; D011044:Poland; D012621:Seasons
chemical_list: D000396:Air Pollutants, Radioactive; D007727:Krypton Radioisotopes