Astronaut’s Organ Doses Inferred from Measurements in a Human Phantom Outside the International Space Station
Reitz, Guenther and Berger, Thomas and Bilski, Pawel and Facius, Rainer and Hajek, Michael and Petrov, Vladislav and Puchalska, Monika and Zhou, Dazhuang and Bossler, Johannes and Akatov, Yury and Shurshakov, Vyacheslav and Olko, Pawel and Ptaszkiewicz, Marta and Bergmann, Robert and Fugger, Manfred and Vana, Norbert and Beaujean, Rudolf and Burmeister, Soenke and Bartlett, David and Hager, Luke and Pálfalvi, József and Szabó, Julianna and O’Sullivan, Denis and Kitamura, Hisashi and Uchihori, Yukio and Yasuda, Nakahiro and Nagamatsu, Aiko and Tawara, Hiroko and Benton, Eric and Gaza, Ramona and McKeever, Stephen and Sawakuchi, Gabriel and Yukihara, Eduardo and Cucinotta, Francis and Semones, Edward and Zapp, Neal and Miller, Jack and Dettmann, Jan (2009) Astronaut’s Organ Doses Inferred from Measurements in a Human Phantom Outside the International Space Station. Radiation Research, 171 (2), pp. 225-235. Radiation Research Society. DOI: 10.1667/RR1559.1.
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Space radiation hazards are recognized as a key concern for human space flight. For long-term interplanetary missions, they constitute a potentially limiting factor since current protection limits for low-Earth orbit missions may be approached or even exceeded. In such a situation, an accurate risk assessment requires knowledge of equivalent doses in critical radiosensitive organs rather than only skin doses or ambient doses from area monitoring. To achieve this, the MATROSHKA experiment uses a human phantom torso equipped with dedicated detector systems. We measured for the first time the doses from the diverse components of ionizing space radiation at the surface and at different locations inside the phantom positioned outside the International Space Station, thereby simulating an extravehicular activity of an astronaut. The relationships between the skin and organ absorbed doses obtained in such an exposure show a steep gradient between the doses in the uppermost layer of the skin and the deep organs with a ratio close to 20. This decrease due to the body self-shielding and a concomitant increase of the radiation quality factor by 1.7 highlight the complexities of an adequate dosimetry of space radiation. The depth-dose distributions established by MATROSHKA serve as benchmarks for space radiation models and radiation transport calculations that are needed for mission planning.
|Title:||Astronaut’s Organ Doses Inferred from Measurements in a Human Phantom Outside the International Space Station|
|Journal or Publication Title:||Radiation Research|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 225-235|
|Publisher:||Radiation Research Society|
|Keywords:||Radiation Research, Human Space Flight, Ionizing Space Radiation, Human Phantom, ISS|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Strahlenbiologie|
|Institutes and Institutions:||Institute of Aerospace Medicine > Radiation Biology|
|Deposited By:||Kerstin Kopp|
|Deposited On:||09 Feb 2009|
|Last Modified:||04 Apr 2013 16:13|
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