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Space radiation analysis: radiation effects and particle interaction outside Earth Magnetosphere using GRAS and GEANT4
2009 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Detailed analyses of galactic cosmic rays (GCR), solar proton events (SPE), and solar fluence effects have been conducted using SPENVIS and CREME96 data files for particle flux outside the Earth’s magnetosphere. The simulation was conducted using GRAS, a European Space Agency (ESA) software based on GEANT4. Dose, dose equivalent and equivalent dose have been calculated as well as secondary particle effects and GCR energy spectrum. The results are based on geometrical models created to represent the International Space Station (ISS) structure and the TransHab structure. The physics models used are included in GEANT4 and validation was conducted to validate the data. The Bertini cascade model was used to simulate the hadronic reactions as well as the GRAS standard electromagnetic package to simulate the electromagnetic effects. The calculated total dose effects, equivalent dose and dose equivalent indicate the risk and effects that space radiation could have on the crew, large amounts of radiation are expected to be obtained by the crew according to the results. The shielding comparison between ISS and TransHab indicate that a tradeoff between the two will have to be made, since the first has a higher protective ratio compared to the TransHab: on the other hand the second one is more flexible and could eventually become a larger structure. The GCRs effects upon the structure are found to be comparable to experimental data.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Space Science, technology, radiation, space radiation, space, physics, cancer, GEANT4, GRAS, ICRU sphere, AG: Antigravity, ALARA: As Low As Reasonably Achievable, ASTAR: stopping power and range tables for helium ions, BERT: Bertini Cascade Model, BNTR: Bimodal Nuclear Thermal Rocket, CERN: European Organization for Nuclear Research, CHIPS: Chiral Invariant Phase Space, CPU: Central Processing Unit, CREME96: Cosmic Ray Effects on Micro Electronics, DOSTEL: DOSimetry TELescopes, ESA: European Space Agency, GCR: Galactic Cosmic Rays, GDML: Geometry Description Markup Language, GEANT4: toolkit for the simulation of the passage of, particles through matter, GNC: Guidance Navigation and Control, GRAS: Geant4 Radiation Analysis for Space, HEP: High Energy Parameterized, ICRU: International Commission on Radiation Units and, Measurements, IMF: Interplanetary Magnetic Field, IMLEO: Initial Mass in Low Earth Orbit, INFI: Instituto Natzionale di Fisica Nuclear), ISP: Specific Impulse, ISS: International Space Station, JPL: Jet Propulsion Laboratory, LEO: Low Earth Orbit, LEP: Low Energy Parameterized, MPD: Magneto Plasma Dynamics, MULASSIS: MUlti‐:LAyered Shielding Simulation Software, NASA: National Aeronautics and Space Administration, NCRP: National Council of Radiation Protection, NEP: Nuclear Electric Propulsion, NERVA: Nuclear Engine Rocket Vehicle Application, NIST: National Institute of Standards and Technology, NTR: Nuclear Thermal Rocket, PSTAR: stopping power and range tables for protons, QGS: Quark Gluon String, S/C: Spacecraft, SPE: Solar Proton Events, SEP: Solar Electric Propulsion, SPENVIS: Space Environment Information System, TEPC: Tissue Equivalent Proportional Counter, TMI: Trans Mars Insertion, TPS: Thermal Protection System
Keyword [sv]
URN: urn:nbn:se:ltu:diva-48735ISRN: LTU-PB-EX--09/107--SELocal ID: 62aca00a-8f31-4acf-8392-9a1d3915ae1eOAI: diva2:1022079
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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