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MUlti-LAyered Shielding SImulation Software (MULASSIS)MULASSIS is a M-C simulation based tool for dose and particle fluence analysis associated with the use of radiation shields. Users can define the shielding and detector geometry as planar or spherical layers, with the material in each layer defined by its density and elemental/isotopic composition. Incident particles can be any Geant4 particles, these include protons, neutrons, electrons, gammas, alphas and light ions. There is a wide choice for their initial energy and angular distribution. In addition, radiation spectra produced by SPENVIS can be inputted when the tool is used within this system. Users can carry out fluence, total Ionising/Non-Ionising Energy Loss (NIEL) dose and Pulse Height Spectrum (PHS) analysis for any layer in the geometry. Fluence can be tallied into energy distribution histograms as a function of particle type and particle angular direction. NIEL analysis can be performed only for layers of silicon material only, as the required NIEL coefficients are not available for other material at the moment. The histograms are output in Comma Separated Values (CSV) format so they can be easily input into other analysis and plotting tools. Users who have a local Geant4 installation can compile the MULASSIS code and use the tool interactively on their local system. The user can make full use of the Geant4 visualisation facilities for the shielding geometry and the particle interaction tracks. MULASSIS has been integrated into the ESA SPENVIS system, thus making
it one of the tools SPENVIS users can choose for their radiation analysis.
MULASSIS and the Geant4 toolkit operate on a separate PC/Linux server
which is http linked to the SPENVIS server. The full MULASSIS functionality
is available via the SPENVIS user interface. In addition the radiation
environment as evaluated by other SPENVIS models can be used as inputs
for the MULASSIS simulation, thus making it very easy to obtain the
modified radiation spectra behind a specific shield defined by the user.
The main reference paper for MULASSIS is published in IEEE Transactions
on Nuclear Science Vol 49 No 6
(2002) P2788-2793. Further information on MULASSIS, as well as the
source code to be used with the Geant4 Toolkit, can be found in the
documents and gzip file listed below. 5-December-2007: Version 1.17 released. Details in the History file. 25-August-2006: Microsoft Window version of MULASSIS is available now! 23-August-2006: Version 1.14 released. Details in the History file. 27-October-2005: Version 1.10 released. Details in the History file. 02-September-2005: Version 1.9 released. See History file for details. 14-July-2005: Window version of MULASSIS is available now! Thanks to
Hugh Evans. It comes as two Windows installers, one for the G4 data
sets and one for the Mulassis executable. You can find zipped versions
at: 10-May-2005: Update to v1.5 binary release. 04-May-2005: version 1.5 released. See History file for the change details. 23-Aug-2004: Version 1.3 released. See History file for detailes. 17-June-2004: Version 1.2 released, pls refer to the History file for details. Draft version of the software user's manual (SUM) is now available. 02-Apr-2004: Version 1.1 released. Works with Geant4 6.1 (tags geant4-V06-01-ref-00, plus event-V06-01-00). This version accepts the new GPS commands. 02-Mar-2004: Version 1.0 released. Also released is an exectable package
which dose not require the installation of Geant4. It is build with
the lattest G4 tag (geant4-06-00-ref-02) with gcc 3.2.2 on a RH 9.0
platform. 23-Sep-2003: Updated version available. Main change is that the Binary Model is the default cascade module for GeV range hadron interactions. 23-Sep-2003: Executable is available for download for Linux system. It is intended for users who just want to run MULASSIS, without going through the trouble of installing the Geant4 toolkit.
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