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Updated: Jul 4, 2026

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
Published on: November 9, 2015
Plutonium isotopes in surface air of Prague in 1986-2006
1National Radiation Protection Institute, Bartoskova 28, 140 00 Prague 4, Czech Republic. zoltan.holgye@suro.cz
Abstract:
Monitoring of 239,240Pu in surface air of Prague started in 1986 in connection with the Chernobyl accident. Measurable activities of 10-28 microBq m(-3) were found from 29 April 1986 to 5 May 1986. In the most of the monitoring periods of 1987-1996, activities of 239,240Pu in air were not measurable. Positive values for 239,240Pu and 238Pu in air could be obtained after installation of an aerosol sampler with higher flow-rate in 1997. Activity concentrations of 239,240Pu and 238Pu in Prague air in the most of quarters of 1997-2006 were in the range 0.53-5.06 and <0.16-1.10 nBq m(-3), respectively. Seasonal fluctuations can be found in content of 239,240Pu in air. Activity ratios of 238Pu/239,240Pu in air are higher than those in top soil, so it can be supposed that 238Pu is coming to air of Prague also from other sources than resuspension of fallout from atmospheric nuclear tests.
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