Universität zu Köln

Falke, Peter, Fischer, Hans-Herbert, Seidensticker, Klaus J., Thiel, Klaus, Fischer, Henning, Hilchenbach, Martin, Henkel, Hartmut and Koch, Andreas (2016). Cosmic ray dose monitoring using RadFET sensors of the Rosetta instruments SESAME and COSIMA. Acta Astronaut., 125. S. 22 - 30. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1879-2030

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Abstract

On its more than 10 years journey to comet 67P/Churyumov-Gerasimenko, Rosetta carried RadFET ionising dose monitors in the central electronics of the orbiter instrument COSIMA and the lander instrument SESAME. The readings of the dosimeters were corrected for the temperature of the devices during measurements. Because the sensitivity of RadFETs depends on the energy of impinging charged particles, a mean efficiency factor for the prevalent proton radiation was determined by applying nine efficiency models to proton energy spectra of Rosetta's radiation environment. The resulting dose profiles show linear increases of the accumulated dose with time, mainly caused by galactic cosmic radiation, and the arrival of two solar particle events in 2005. The accumulated dose (in Silicon) during 3909 days in space from 2004-03-02 to 2014-11-14 was 3.2 +/- 0.6 Gy in case of COSIMA and 1.9 +/- 0.4 Gy for SESAME. The deviation of the two measurements is mainly due to the solar particle event in September 2005, which had a 5.3 +/- 1.0 times stronger impact on the COSIMA RadFET. Measured dose levels are one order of magnitude lower than those expected before launch for not being exceeded on the 90% confidence level, which is mainly due to the low solar activity during the mission so far. (C) 2016 IAA. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Falke, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Hans-Herbert UNSPECIFIED UNSPECIFIED UNSPECIFIED Seidensticker, Klaus J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thiel, Klaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Henning UNSPECIFIED UNSPECIFIED UNSPECIFIED Hilchenbach, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Henkel, Hartmut UNSPECIFIED UNSPECIFIED UNSPECIFIED Koch, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-268512
DOI:	10.1016/j.actaastro.2016.03.001
Journal or Publication Title:	Acta Astronaut.
Volume:	125
Page Range:	S. 22 - 30
Date:	2016
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1879-2030
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RADIATION Multiple languages Engineering, Aerospace Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26851