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Simulation of the Heavy Ion Contribution to the Radiation Environment onboard the International Space Station
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
2013 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The health risks from exposure to the space radiation environment makes it important

to have reliable simulation models for the radiation doses inside spacecrafts. Simulations

of the heavy ion parts, especially iron, of the Galactic Cosmic Ray (GCR) radiation has

been carried out using the simulation software Geant4 with geometry models from the

DESIRE project. The total dose rate from iron ions is found to be 1.57

Gy=d and dose

equivalent is found to be 17

Sv=d. This means that iron contributes between 5% and

10% to the total dose equivalent from the GCR radiation, substantially higher than its

relative abundance of 0.03 percent.

67% of the dose rate from iron comes from particles with energies in the range 1 000 -

10 000 MeV/nucleon, and 26% comes from particles in the 10 000 - 50 000 MeV/nucleon

range. The great majority of the dose is deposited by iron ions, opposed to secondary

particles. This result was not expected. Calculated dose rates are found not to be

significantly dependent of the ISS altitude.

Place, publisher, year, edition, pages
2013. , 22 p.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-129324OAI: diva2:651644
Available from: 2013-09-26 Created: 2013-09-26 Last updated: 2013-09-26Bibliographically approved

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