Crew Radiation Exposure Estimates from GCR and SPE Environments During a Hypothetical Mars Mission

Simple item page
dc.creatorMcGirl, Natalie
dc.creatorPawel, A.J.
dc.creatorSchappel, Daniel
dc.creatorShamblin, Jacob
dc.creatorYounkin, Timothy
dc.creatorTownsend, Lawrence
dc.date.accessioned2016-07-28T18:01:13Z
dc.date.available2016-07-28T18:01:13Z
dc.date.issued2016-07-10
dc.descriptionUnited States
dc.descriptionUniversity of Tennessee
dc.description503
dc.descriptionICES503: Radiation Issues for Space Flight
dc.descriptionVienna, Austria
dc.descriptionNatalie A. McGirl, University of Tennessee, USA
dc.descriptionA.J. Pawel, University of Tennessee, USA
dc.descriptionDaniel P. Schappel, University of Tennessee, USA
dc.descriptionJacob Shamblin, University of Tennessee, USA
dc.descriptionTimothy R. Younkin, University of Tennessee, USA
dc.descriptionLawrence W. Townsend, University of Tennessee, USA
dc.descriptionThe 46th International Conference on Environmental Systems was held in Vienna, Austria, USA on 10 July 2016 through 14 July 2016.
dc.description.abstractSome recent analyses of potential radiation exposures to crews on the surface of Mars focused solely on exposures from extremely large solar particle events (SPE). These analyses estimated radiation doses to critical organs, as well as effective doses, and compared them to crew permissible exposure limits. Contributions to crew exposures from galactic cosmic rays (GCR) were not addressed. In this work we present results for crew exposure estimates from GCR particles, as well as SPE protons. We assume a 200-day transit between Earth and Mars, a 500-day stay on the surface of Mars, and a 200-day transit from Mars back to Earth. For the transit phases of the mission we assume that the crew is protected by a spacecraft having 20 g cm-2 aluminum or 40 g cm-2 aluminum shielding. For the stay on the surface of Mars, we assume a habitat shielded by 40 g cm-2 aluminum within the Martian atmosphere at altitudes of 0 km and -7 km – the former corresponding to the mean surface elevation, and the latter to the depth of the Hellas Impact Basin. The mission is assumed to begin 450 days prior to solar maximum and to end 450 days after solar maximum. The maximum for solar cycle 23 is used and assumed to have occurred on May 15, 2000. Radiation exposure estimates are obtained utilizing the Online Tool for the Assessment of Radiation in Space (OLTARIS) computational tool developed at NASA Langley Research Center. For the SPE contributions, the maximum SPE proton fluences that can be tolerated without exceeding career radiation limits are estimated, after accounting for the contribution to the total mission effective dose from the chronic GCR background exposures.
dc.format.mimetypeapplication/pdf
dc.identifier.otherICES_2016_59
dc.identifier.urihttp://hdl.handle.net/2346/67500
dc.language.isoeng
dc.publisher46th International Conference on Environmental Systems
dc.subjectgalactic cosmic ray
dc.subjectsolar particle event
dc.subjectdose
dc.subjecteffective dose
dc.titleCrew Radiation Exposure Estimates from GCR and SPE Environments During a Hypothetical Mars Mission
dc.typePresentation

Files

Original bundle

Now showing 1 - 1 of 1
Thumbnail Image
Name:
ICES_2016_59.pdf
Size:
310.87 KB
Format:
Adobe Portable Document Format
Download

Collections

International Conference on Environmental Systems