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Overview of the ISS radiation environment observed during the ESA EXPOSE-R2 mission in 2014-2016

Dachev, T. P. and Bankov, N. G. and Tomov, B. T. and Matviichuk, Yu. N. and Dimitrov, Pl. G. and Häder, D.-P. and Horneck, G. (2017) Overview of the ISS radiation environment observed during the ESA EXPOSE-R2 mission in 2014-2016. Space Weather. Wiley. DOI: 10.1002/2016SW001580 ISSN 1542-7390

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Official URL: http://dx.doi.org/10.1002/2016SW001580

Abstract

The radiation risk radiometer-dosimeter (R3D)-R2 solid-state detector performed radiation measurements at the European Space Agency EXPOSE-R2 platform outside of the Russian “Zvezda” module at the International Space Station (ISS) from 24 October 2014-11 January 2016. The ISS orbital parameters were: average altitude of 415 km and 51.6° inclination. We developed special software and used experimentally-obtained formulas to determine the radiation flux-to-dose ratio from the R3DR2 Liulin-type deposited-energy spectrometer. We provide for the first time simultaneous, long-term estimates of radiation dose external to the ISS for four source categories: (i) galactic cosmic ray particles and their secondary products; (ii) protons in the South Atlantic Anomaly region of the inner radiation belt (IRB); (iii) relativistic electrons and/or bremsstrahlung in the outer radiation belt (ORB); and (iv) solar energetic particle (SEP) events. The latter category is new in this study. Additionally, in this study, secondary particles (SP) resulting from energetic particle interaction with the detector and nearby materials are identified. These are observed continuously at high latitudes. The detected SPs are identified using the same sorting requirements as SEP protons. The IRB protons provide the highest consistent hourly dose, while the ORB electrons and SEPs provide the most extreme hourly doses. SEPs were observed 11 times during the study interval. The R3DR2 data support calculation of average equivalent doses. The 30-day and 1-year average equivalent doses are much smaller than the skin and eyes doses recommendations by the National Council on Radiation Protection (Report 132), which provides radiation protection guidance for Low Earth Orbit.

Item URL in elib:https://elib.dlr.de/114591/
Document Type:Article
Title:Overview of the ISS radiation environment observed during the ESA EXPOSE-R2 mission in 2014-2016
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dachev, T. P.Space Research and Technology Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria; tdachev59 (at) gmail.comUNSPECIFIED
Bankov, N. G.Space Research and Technology Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria.UNSPECIFIED
Tomov, B. T.Space Research and Technology Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria.UNSPECIFIED
Matviichuk, Yu. N.Space Research and Technology Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria.UNSPECIFIED
Dimitrov, Pl. G.Space Research and Technology Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria.UNSPECIFIED
Häder, D.-P.Friedrich-Alexander Universität Erlangen-Nürnberg, Dept. Biology, Neue Str. 9, 91096 Möhrendorf, GermanyUNSPECIFIED
Horneck, G.radiation biology department, institute of aerospace medicine, german aerospace center (dlr), cologne, germany.UNSPECIFIED
Date:2017
Journal or Publication Title:Space Weather
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI :10.1002/2016SW001580
Publisher:Wiley
ISSN:1542-7390
Status:Published
Keywords:European Space Agency EXPOSE-R2 platform, ISS, radiation risk radiometer-dosimeter (R3D)-R2
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:27 Oct 2017 12:57
Last Modified:21 Sep 2019 05:05

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