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Cosmic Radiation Exposure of Biological Test Systems During the EXPOSE-E Mission

Berger, Thomas und Hajek, Michael und Bilski, Pawel und Körner, Christine und Vanhavere, Filip und Reitz, Günther (2012) Cosmic Radiation Exposure of Biological Test Systems During the EXPOSE-E Mission. Astrobiology, 12 (5), Seiten 387-392. Mary Ann Liebert, Inc.. DOI: 10.1089/ast.2011.0777. ISSN 1531-1074.

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Kurzfassung

In the frame of the EXPOSE-E mission on the Columbus external payload facility EuTEF on board the International Space Station, passive thermoluminescence dosimeters were applied to measure the radiation exposure of biological samples. The detectors were located either as stacks next to biological specimens to determine the depth dose distribution or beneath the sample carriers to determine the dose levels for maximum shielding. The maximum mission dose measured in the upper layer of the depth dose part of the experiment amounted to 238 ± 10 mGy, which relates to an average dose rate of 408 ± 16 μGy/d. In these stacks of about 8mm height, the dose decreased by 5-€“12% with depth. The maximum dose measured beneath the sample carriers was 215 ± 16 mGy, which amounts to an average dose rate of 368 ± 27 μGy/d. These values are close to those assessed for the interior of the Columbus module and demonstrate the high shielding of the biological experiments within the EXPOSE-E facility. Besides the shielding by the EXPOSE-E hardware itself, additional shielding was experienced by the external structures adjacent to EXPOSE-E, such as EuTEF and Columbus. This led to a dose gradient over the entire exposure area, from 215 ± 16 mGy for the lowest to 121 ± 6 mGy for maximum shielding. Hence, the doses perceived by the biological samples inside EXPOSE-E varied by 70% (from lowest to highest dose). As a consequence of the high shielding, the biological samples were predominantly exposed to galactic cosmic heavy ions, while electrons and a significant fraction of protons of the radiation belts and solar wind did not reach the samples.

Dokumentart:Zeitschriftenbeitrag
Titel:Cosmic Radiation Exposure of Biological Test Systems During the EXPOSE-E Mission
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Berger, ThomasRadiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Hajek, Michael Institute of Atomic and Subatomic Physics (ATI), Vienna University of Technology, Vienna, Austria.
Bilski, Pawel Department of Radiation Physics and Dosimetry, Institute of Nuclear Physics (IFJ), Krakow, Poland.
Körner, Christine Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Vanhavere, Filip Belgian Nuclear Research Centre (SCK-CEN), Mol, Belgium.
Reitz, Günther Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.
Datum:2012
Erschienen in:Astrobiology
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:12
DOI :10.1089/ast.2011.0777
Seitenbereich:Seiten 387-392
Verlag:Mary Ann Liebert, Inc.
ISSN:1531-1074
Status:veröffentlicht
Stichwörter:Space radiation, Dosimetry, Passive radiation detectors, Thermoluminescence, EXPOSE-E
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Forschung unter Weltraumbedingungen
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Strahlenbiologie
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Luft- und Raumfahrtmedizin > Strahlenbiologie
Hinterlegt von: Kerstin Kopp
Hinterlegt am:08 Aug 2012 15:24
Letzte Änderung:27 Mai 2013 15:27

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