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Ionising Radiation > Environmental radioactivity > ARTM-Model
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ARTM (Atmospheric Radionuclid Transport Model)
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In the course of a revision of the General Administrative Provision (AVV) relating to Section 47 of the Radiation Protection Ordinance (StrISchV) and the Incident Calculation Bases (SGB) relating to Section 49 StrISchV an update of the employed model (Gaussian Plume) has been considered.
It should be replaced with the more advanced Lagrange Particle Dispersion Model used in connection with the Technical Instruction on Air Quality Control (TA Luft) of 24 July 2002.
For this purpose, the AUSTAL2000 code package devised for modelling the dispersion of conventional air pollutants was adapted and improved to consider the dispersion of airborne radioactive materials (ARTM, Atmospheric Radionuclide Transport Model):
In ARTM, algorithms eg. for the consideration of gamma cloudshine as well as of wet deposition were developed and implemented in the existing source code of the latest version of AUSTAL2000. Furthermore, interfaces with the existing calculation bases SBG and AVV were established, i.e. dose calculations were not included; the dispersion calculation ends rather more with the interface to the dose part of the calculation bases. This also allows the calculation of the dose according to other dose models not contained in the calculation bases.
A research project included the specification of model assumptions, technical
boundary conditions and model parameters, the implementation in the ARTM computer code, verification and validation, and a comprehensive test phase with the involvement of many users from different institutions.
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Figure 1: ARTM calculated average groundlevel air activity from constant yearly discharge of 1 Bq/s Cs-137 in emission height of 160m
(please click at the figure to enlarge the map) |
Figure 2: ARTM calculated average groundlevel air activity from constant daily discharge of 1 Bq/s Cs-137 in emission height near the surface
(please click at the figure to enlarge the map) |
The ARTM code system (which is based on the "TA Luft" and the AUSTAL2000 code
package) for the calculation of the dispersion and deposition of released airborne radioactive materials represents the state of the art in science and technology. A standardised procedure for conventional (AUSTAL2000) and radiological (ARTM) applications will provide a high level of legal certainty for the user. Compared with the classic Gaussian Plume Model applied so far, the simulation of atmospheric dispersion and deposition with an advanced Lagrange Particle Dispersion Model (in combination with a flow model and turbulence parameterisation) for licensing-related applications ensures more flexible and realistic modelling.
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