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Summary:
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A Model for Short and Medium Range Dispersion of Radionuclides
Released to the Atmosphere.
The abstract of
the document is given below.
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Price:
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£5.00
ISBN 0-85951-117-0
Available from NRPB
archive.
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 PDF
download:
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The full document
(PDF, 5.1 MB, 82 pages)
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ABSTRACT
This report is the first of
a series which will give practical guidance on the estimation of the dispersion
of radioactive releases to the atmosphere. It represents the conclusions
of a Working Group established to review recent developments in atmospheric
dispersion modelling and to propose models for use within the UK. This
first report deals with the estimation of dispersion in the short and
medium range, that is from about 100 m to a few tens of kilometres from
the source, and is based upon a Gaussian plume model. A scheme is presented
for categorising atmospheric conditions and values of the associated dispersion
parameters are given. Typical results are presented for releases in specific
meteorological conditions and a scheme is included to allow for durations
of release of up to 24 hours. Consideration has also been given to predicting
longer tern average concentrations, typically annual averages, and results
are presented which facilitate site specific calculations. The results
of the models are extended to 100 km from the source, but the increasing
uncertainty with which results may be predicted beyond a few tens of kilometres
from the source is emphasised.
The three technical appendices provide some of
the rationale behind the decisions made in adopting the various models
in the proposed dispersion scheme. These appendices have been contributed
by individual members of the Working Group.
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