alexa Biological ultraviolet Dosimetry in Low Earth's Orbit
ISSN: 2332-2519

Journal of Astrobiology & Outreach
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Research Article

Biological ultraviolet Dosimetry in Low Earth's Orbit

Attila Berces1, Marianna Egyeki1, Andrea Fekete1, Gaspar Kovacs2 and Gyorgyi Ronto1,3*
1Institute of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
2Honved Medical Center, Hungarian Defense Forces, Dept. Radiation Biology, Budapest, Hungary
3Research Group for Biophysics, Hungarian Academy of Sciences, Budapest, Hungary
Corresponding Author : Gyorgyi Ronto
Semmelweis University, Budapest, Inst. Biophysics & Radiation Biology
Tuzolto u.37-47, H-1094 Budapest, Hungary
E-mail: [email protected]
Received April 22, 2013; Accepted July 04, 2013; Published July 08, 2013
Citation: Berces A, Egyeki M, Fekete A, Kovacs G, Ronto G (2013) Biological Ultraviolet Dosimetry in Low Earth’s Orbit. Astrobiol Outreach 1:104. doi:10.4172/2332-2519.1000104
Copyright: © 2013 Berces A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

The biological dosimetry of the solar UV radiation functioned correctly on the Earth’s surface. The aim of the present studies was to extend the dosimetry to the extraterrestrial solar radiation in LEO. Similar to the Earth’s surface bacteriophage T7 and polycrystalline uracil thin layers were used as detectors and exposed to the simulated and to the real space environmental parameters aiming to perform the in situ biological UV dosimetry in the space, more exactly on the external pallet of the ISS. The UV detectors have been used in specific cases in thin layer form. In contrast to the Earth’s surface the extraterrestrial solar UV radiations contains wavelength components (λ ~ 190-200 nm), which cause photolesions (photoproducts) in the nucleic acids/their components similar to the UV-B photons. However, these wavelengths cause not only photolesions but with a wavelength-dependent efficiency the reversion of some photolesion, too. Our biological detectors measured either in simulation or in situ conditions the resultant of both reactions induced by the extraterrestrial UV radiation. From this aspect the role of the photoreversion in the extension of the biological UV dosimetry and in the survival of the living systems in the space are discussed.

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