MULASSIS – MUlti-LAyer Shielding SImulation Software

MULASSIS is a Geant4-based tool that deals with common radiation analyses types (TID, NIEL, fluence, …) in layered geometry models. The models can take either a spherical shell or planar slab geometry.

Mulassis is an Monte-Carlo 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 (only up to He-4 currently; heavier ions will be treated after the release of kinetic and QMD models in Geant4). 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. The Geant4 toolkit comes with a rich collection of physics models, and it is not an easy task to pick the right combinations even for an experienced physicist.

Other Geant4 applications in the space domain can be found here.

Relevant papers:

Truscott, P.; Lei, Fan; Dyer, C.; Quaghebeur, B.; Heyndericks, D.; Nierninen, P.; Evans, H.; Daly, E.; Mohammadzadeh, A.; Hopkinson, G.: Mulassis - monte carlo radiation shielding simulation for space applications made easy. In: Proceedings of the 7th European Conference on Radiation and Its Effects on Components and Systems, 2003. RADECS 2003., pp. 191-196, 2003. (Type: Proceedings Article | BibTeX)
Santina, G.; Nieminen, P.; Evansa, H.; Daly, E.; Lei, F.; Truscott, P. R.; Dyer, C. S.; Quaghebeur, B.; Heynderickx, D.: New Geant4 based simulation tools for space radiation shielding and effects analysis. In: Nuclear Physics B - Proceedings Supplements, vol. 125, pp. 69-74, 2003, ISSN: 0920-5632, (Innovative Particle and Radiation Detectors). (Type: Journal Article | Abstract | Links | BibTeX)
Lei, F.; Truscott, R. R.; Dyer, C. S.; Quaghebeur, B.; Heynderickx, D.; Nieminen, R.; Evans, H.; Daly, E.: MULASSIS: a Geant4-based multilayered shielding simulation tool. In: IEEE Transactions on Nuclear Science, vol. 49, no. 6, pp. 2788-2793, 2002. (Type: Journal Article | Links | BibTeX)

Access to the software:

The access to the code is open upon registration with the ESSR.

The authors kindly ask to reference the MULASSIS official paper (DOI: 10.1109/TNS.2002.805351) in all publications in which the MULASSIS code was used. This is valid both when the MULASSIS tool was used directly, and in case significant parts of the MULASSIS source code were taken for use in private code.

We also welcome feedback from MULASSIS users, in form of bug reports, suggestions for further development or generic comments.

Latest MULASSIS version: release ml-v02-00, and user manual.

In case of problems with the registration process, please contact us.

  • License: ESA Open Source Community
  • Status: Mature
  • Developed by: QinetiQ, Kallisto Consultancy, RadMod Research, L. Desorgher, V. Ivantchenko, and many others.