Uracil dosimeter in simulated extraterrestrial condition

A. Bérces, G. Kovács, T. Kerékgyártó, Gy Rontó, H. Lammer, G. Kargl, N. I. Kömle

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

A polycrystalline uracil thin layer detector has been developed for UV dosimetry on the Earth's surface in the Laboratory. Exponential response of the uracil polycrystal has been detected both by absorption spectroscopy and measurements of the refractive index under the influence of terrestrial solar radiation or using UV-C sources [1, 2]. In UV biological dosimetry the UV dose scale is additive starting at a value of zero according to the definition of CIE (Technical Report TC-6-18). The biological dose can be defined by a measured end-effect. In our dosimeter exposed to natural (terrestrial) UV radiation the proportion of pyrimidin photoproducts among the total photoproducts is smaller than 0.1 and the linear correlation between the biological and physical dose is higher than 0.9 [3].According to the experimental data this linear relationship is often not valid. We observed that UV radiation did not only induce dimerisation but shorter wavelengths caused monomerisation of pyrimidin dimers. Performing the irradiation in oxygen free environment and using a deuterium lamp as UV source, we could increase monomerisation against dimerisation thus the DNA-based dosimetry's additivity rule is not fulfilled in these conditions. In this study we will demonstrate those non-linear experiments which constitute the basis of our biological experiments on the International Space Station.

Original languageEnglish
Pages (from-to)431-432
Number of pages2
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number518
Publication statusPublished - Sep 1 2002
EventProceedings of the Second European Workshop on Exo-Astrobiology - Graz, Austria
Duration: Sep 16 2002Sep 19 2002

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ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

Cite this

Bérces, A., Kovács, G., Kerékgyártó, T., Rontó, G., Lammer, H., Kargl, G., & Kömle, N. I. (2002). Uracil dosimeter in simulated extraterrestrial condition. European Space Agency, (Special Publication) ESA SP, (518), 431-432.