Long-term investigations of radioactive matter in the air of Zagreb, Croatia

Title: Long-term investigations of radioactive matter in the air of Zagreb, Croatia

Author: Franic, Z.; Marovic, G.; Sencar, J.

Reference: Atmospheric Research, Sept. 2008, vol.89, no.4, pp. 391-5

doi: 10.1016/j.atmosres.2008.03.005

Keywords: Radioactivity; ¹³⁷Cs; ⁷Be; Chernobyl accident; Effective dose

Abstract: Investigations on the distribution and fate of naturally occurring, nuclear-weapons-produced, and reactor-released radionuclides in the city of Zagreb, Coatia, have been conducted as part of the monitoring program for radioactive contamination of the human environment in Croatia since the early 1960s. This paper describes long-term investigations of man-made ¹³⁷Cs and naturally occurring ⁷Be in the city of Zagreb after the Chernobyl accident. The Chernobyl nuclear accident caused a major increase in ¹³⁷Cs activity concentrations only in 1986, which quickly decreased over the next few years to pre-Chernobyl values. The observed mean residence time for ¹³⁷Cs in the air during the post-Chernobyl period from January 1987 to December 1990 was estimated to be 1.0 year. During this period, the observed mean residence time for ¹³⁷Cs in fallout was estimated to be 0.9 years. The mean ⁷Be activity concentration in the air from 1987 to 2004 was (5.4 ± 2.8) × 10^− 3 Bq m^− 3. The measured ⁷Be activity concentrations showed seasonal behavior with the highest usually measured in July.

URL: http://www.sciencedirect.com/science/article/pii/S0169809508000689

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