Izvorni znanstveni članak
HANDLING “DIRTY BOMB”-SCENARIOS WITH THE LAGRANGIAN PARTICLE MODEL LASAIR
Hartmut Walter
; Federal Office for Radiation Protection (BfS/SW 2.2), Oberschleissheim, Germany
Sažetak
An existing systems programme (LASAT) based on Lagrangian Particle Simulation has been adjusted to meet requirements
of emergency authorities. The new model (LASAIR, Lagrangian Simulation of the Dispersion and Inhalation of Radionuclides)
is able to simulate an explosion of an RDD (Radiological Dispersion Device) with additional radioactive material and computes
the transport in the planetary boundary layer as well as dry and wet deposition on the ground. In order to assess the main
pathways of radiation exposure to the population, the inhalation, ground- and cloudshine dose to individuals can be computed. The
model has been introduced as a rapid decision support system within the Federal Office for Radiation Protection in Germany. LASAIR
is applied as well in other (EU-) countries.
One of the most interesting features of the model is the basic meteorological input combined with a powerful and well validated
diagnostic flow model and a Lagrangian particle model. LASAIR can be used either as a back-office decision tool or during in
field/on scene operations. LASAIR has a special parameterisation of the initial cloud due to explosive material, which is based on
explosion experiments on test sites of the German Armed Forces in 2003 and 2007.
A comparison to the well known EU-model RODOS as well as to other models (HEAT, HOTSPOT, TATOO) has started in 2008
and first results will be presented. They clearly demonstrate the ability of the Lagrangian Particle Models (LPM) especially compared
to Gaussian Models (GM) or Gaussian Puff Models (GPM).
Ključne riječi
dispersion,Lagrangian particle model; dirty bomb; LASAIR; LASAT; radiation pathway
Hrčak ID:
64247
URI
Datum izdavanja:
12.12.2008.
Posjeta: 1.442 *