The radiation environment on the surface of Mars - Numerical calculations of the galactic component with GEANT4/PLANETOCOSMICS

Daniel Matthiä; Thomas Berger

doi:10.1016/j.lssr.2017.03.005

The radiation environment on the surface of Mars - Numerical calculations of the galactic component with GEANT4/PLANETOCOSMICS

Life Sci Space Res (Amst). 2017 Aug:14:57-63. doi: 10.1016/j.lssr.2017.03.005. Epub 2017 Apr 1.

Authors

Daniel Matthiä¹, Thomas Berger²

Affiliations

¹ German Aerospace Center, Institute of Aerospace Medicine, Linder Höhe, 51147 Cologne, Germany. Electronic address: Daniel.Matthiae@dlr.de.
² German Aerospace Center, Institute of Aerospace Medicine, Linder Höhe, 51147 Cologne, Germany.

PMID: 28887945
DOI: 10.1016/j.lssr.2017.03.005

Abstract

Galactic cosmic radiation and secondary particles produced in the interaction with the atmosphere lead to a complex radiation field on the Martian surface. A workshop ("1st Mars Space Radiation Modeling Workshop") organized by the MSL-RAD science team was held in June 2016 in Boulder with the goal to compare models capable to predict this radiation field with each other and measurements from the RAD instrument onboard the curiosity rover taken between November 15, 2015 and January 15, 2016. In this work the results of PLANETOCOSMICS/GEANT4 contributed to the workshop are presented. Calculated secondary particle spectra on the Martian surface are investigated and the radiation field's directionality of the different particles in dependence on the energy is discussed. Omnidirectional particle fluxes are used in combination with fluence to dose conversion factors to calculate absorbed dose rates and dose equivalent rates in a slab of tissue.

Keywords: GEANT4; Galactic cosmic radiation; Mars; Monte-Carlo; Particle flux; Radiation exposure.

MeSH terms

Cosmic Radiation*
Environmental Exposure / analysis*
Extraterrestrial Environment*
Humans
Mars*
Radiation Dosage
Radiation Monitoring / instrumentation*
Radiation Protection