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Radiation Protection Dosimetry 108:161-168 (2004)
© 2004 © Oxford University Press 2004; all rights reserved

Experimental evaluation of gamma fluence-rate predictions from Argon-41 releases to the atmosphere over a nuclear research reactor site

Carlos Rojas-Palma1, Helle Karina Aage4, Poul Astrup2, Kim Bargholz3, Martin Drews2, Hans E. Jørgensen2, Uffe Korsbech4, Bent Lauritzen2,*, Torben Mikkelsen2, Søren Thykier-Nielsen2 and Raf Van Ammel1

1 Belgian Nuclear Research Center (SCK·CEN), Boeretang 200, B-2400 Mol, Belgium
2 Risø National Laboratory, DK-4000 Roskilde, Denmark
3 Danish Emergency Management Agency, DK-3460 Birkerød, Denmark
4 Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark

* Corresponding author: bent.lauritzen{at}risoe.dk

An experimental study of radionuclide dispersion in the atmosphere has been conducted at the BR1 research reactor in Mol, Belgium. Artificially generated aerosols (‘white smoke’) were mixed with the routine releases of 41Ar in the reactor's 60-m tall venting stack. The detailed plume geometry was measured with remote sensing (Lidar) of the aerosol plumes while surface radiation levels were measured under the plume using gamma detectors at downwind distances of up to 1500 m from the release point. A database was built with simultaneous measurements of plume geometry and radiation field from 41Ar decay, together with in-situ measurements of meteorological parameters. The joint tracer/radiation experimental dataset has been subsequently used to evaluate the accuracy of predictions of dispersion parameters and gamma fluence rates obtained by the atmospheric dispersion and dose rate model RIMPUFF.


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