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Title
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Parametrization of homogeneous forested areas and effect on simulated dose rates near a nuclear research reactor
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Author
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Abstract
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| One of the major uncertainties in dispersion-based simulations at the local scale is the representation of terrain effects. The aim of the current study is to quantify this type of uncertainty for dose-rate predictions over a homogeneous forest cover. At the Belgian reactor BR1, situated in a forested environment, ambient gamma-doserate data from routine Ar-41 releases are available in the first 300 m from the release point. We develop a forest parameterization that meets the site-specific needs, and integrate it in different dispersion models. Using different terrain-roughness parameterizations, we compare three types of models: a dispersion model driven by a Langevin equation, an advection-diffusion model, and a Gaussian plume model as a special case of the latter one. We find that all models are biased up to a factor of four, partly due to an uncertain source strength. The dose-rate uncertainty due to the model choice is a factor of 2.2 for a stack release and a factor of 14 for a ground release. |
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Language
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English
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Source (journal)
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Journal of environmental radioactivity. - London
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Publication
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London
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2020
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ISSN
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0265-931X
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DOI
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10.1016/J.JENVRAD.2020.106445
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Volume/pages
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225
(2020)
, 15 p.
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Article Reference
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106445
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ISI
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000600908300009
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Pubmed ID
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33122127
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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