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

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

Full text not available from this repository.

Abstract

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.

Document Type:Article
Title:Cosmic Radiation Exposure of Biological Test Systems During the EXPOSE-E Mission
Authors:
AuthorsInstitution or Email of Authors
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.
Date:2012
Journal or Publication Title:Astrobiology
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:12
DOI:10.1089/ast.2011.0777
Page Range:pp. 387-392
Publisher:Mary Ann Liebert, Inc.
ISSN:1531-1074
Status:Published
Keywords:Space radiation, Dosimetry, Passive radiation detectors, Thermoluminescence, EXPOSE-E
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kerstin Kopp
Deposited On:08 Aug 2012 15:24
Last Modified:27 May 2013 15:27

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