Radiation source rate estimation through data assimilation of gamma dose rate measurements for operational nuclear emergency response systems
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Date
2012-01-01
Journal Title
Journal ISSN
Volume Title
Publisher
Inderscience Enterprises Ltd
Abstract
This paper presents an evaluation of an innovative data assimilation
method that has been recently developed in NCSR Demokritos for estimating
an unknown emission rate of radionuclides in the atmosphere, with real-scale
experimental data. The efficient algorithm is based on the assimilation of
gamma dose rate measured data in the Lagrangian atmospheric dispersion
model DIPCOT and uses variational principles. The DIPCOT model is used in
the framework of the nuclear emergency response system (ERS) RODOS. The
evaluation is performed by computational simulations of dispersion of Ar-41
that was emitted routinely by the Australian Nuclear Science and Technology
Organisation’s (ANSTO) previous research reactor, HIFAR, located in Sydney,
Australia. In this paper the algorithm is evaluated against a more complicated
Radiation source rate estimation through data assimilation 387
case than the others used in previous studies: There was only one monitoring
station available each day and the site topography is characterised as
moderately complex. Overall the estimated release rate approaches the real one
to a very satisfactory degree as revealed by the statistical indicators of errors. © 2012 Inderscience Enterprises Ltd.
Description
Keywords
Radiation sources, Radioisotopes, Variational methods, Lagrangian field theory, Dispersions, Gamma radiation
Citation
Tsiouri, V., Andronopoulos, S., Kovalets, I., Dyer, L. L., & Bartzis, J. G. (2012). Radiation source rate estimation through data assimilation of gamma dose rate measurements for operational nuclear emergency response systems. Paper presented at HARMO13 - 1-4 June 2010, Paris, France, 13th Conference on Harmonisation within Atmospheric Disperson Modelling for Regulatory Purposes. In International Journal of Environment and Pollution, 50(1-4), 386-395. doi:10.1504/IJEP.2012.051209