Geant4 for space: mission simulations and engineering tools

Radiation shielding analysis is a crucial process in the spacecraft and space instrument development cycle. A number of dedicated tools have been developed in the last decades Cor the study of the effects of radiation on materials and instruments in space. We present here a set of detailed analyses based on Monte Carlo radiation transport simulations, and dew tools for space applications, both based on the Geant4 simulation toolkit, devetoped as part of the European Space Agency activities in the Geant4 collaboration. I N recent years the use of Monte Carlo (MC) simulations has rapidly increased in the space domain, with applications ranging from instrument and detector response verification to radiation shielding optimisation, component effects, support of scientific studies, and analysis of biological effects. The advance in computer technology and the advent of new simulation toolkits for particle transport such as Geant4 have allowed MC studies to be not anymore reserved for research scientists but to become standard engineering tools. Radiation shielding analysis is a crucial process in the spacecraft and space instrument development cycle. A number of dedicated tools have been developed in the last decades for the study of the effects of radiation on materials and instruments in space. We present here a set of applications and new tools for space based on the Geant4 simulation toolkit, developed as part of the European Space Agency (ESA) activities in the Geant4 collaboration. 11. THE ROLE OF GEANT4 IN THE SPACE DOMAIN