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.
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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.
|Title:||Cosmic Radiation Exposure of Biological Test Systems During the EXPOSE-E Mission|
|Journal or Publication Title:||Astrobiology|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 387-392|
|Publisher:||Mary Ann Liebert, Inc.|
|Keywords:||Space radiation, Dosimetry, Passive radiation detectors, Thermoluminescence, EXPOSE-E|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Raumfahrt|
|HGF - Program Themes:||R FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Raumfahrt|
|DLR - Program:||R FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||R - Vorhaben Strahlenbiologie|
|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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