| 1. |
- Fuglesang, Christer, 1957-, et al.
(författare)
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Relative nuclear abundances, LET and dose rates at various locations and configurations in ISS from the ALTCRISS experiment
- 2013
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Ingår i: 64th International Astronautical Congress.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Over the years many devices, using different technologies and various locations, have been used - and are still in use - on the International Space Station, ISS, to measure and map the radiation and cosmic particle flux which astronauts as well as sensitive electronics are exposed to. This presentation presents recent analyses and results from the SilEye-3/Alteino detector during the ESA-sponsored project ALTCRISS. Comparisons are made with data from other experiments, such as ALTEA and PADLES. Alteino is a Si-strip detector, developed from the two SilEye detectors that were operated on Mir, in particular for studies of the Light Flash phenomena. Alteino was used at several locations, and orientations, in the Russian segment of ISS from late 2005 through 2007. Many of the data sets were obtained with a shielding of 5 g/cm2 polyethylene in front of the detector. Data on nuclei from C to Fe in the energy range above ≃ 60 MeV/n show an increase in relative abundance for odd Z inside ISS compared to the outside, due to fragmentation in the hull. Fluxes and relative abundances vary with location and shielding, where the material of the station itself plays a major role. The difference in flux can be as much as 50%. LET spectra - which are not restricted to single particle events - show similar tendencies, though when converted to equivalent dose rates the effect of the polyethylene is somewhat pronounced. Comparison with ALTEA data shows slightly higher dose rates for Alteino in the Russian segment, which can be expected due to that ALTEA operated in the US lab Destiny with more station material around it. As expected, the response of CR39 in terms of equivalent dose rate is higher than Alteino, due to the smaller acceptance energy range of the latter.
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| 2. |
- Larsson, Oscar, et al.
(författare)
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Relative nuclear abundance from C to Fe and integrated flux inside the Russian part of the ISS with the Sileye-3/Alteino experiment
- 2014
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Ingår i: Journal of Physics G. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 41:1, s. 015202-
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Tidskriftsartikel (refereegranskat)abstract
- In this work we present data from the Sileye-3/Alteino detector on board the International Space Station (ISS), which was gathered following a recalibration after several years in orbit. We also measure the relative nuclei abundance and integrated flux, which were normalized to the solar modulation values of August 2007. The measurements were made at different locations of the Russian part of the ISS. The relative nuclear abundances of C to Fe in relation to C, in an energy range above similar or equal to 60 MeV/n, shows high levels of odd Z particles inside the ISS and an under-abundance of C and O compared with the galactic spectrum, as presented by Simpson in 1983. In addition, the values of the integrated flux varies primarily according to location and detector orientation. An additional polyethylene shield also reduces the flux, although in a lower amount than changes in the orientation of the telescope. Data were taken as part of the ESA ALTCRISS project from late 2005 through to 2007.
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| 3. |
- Casolino, M., et al.
(författare)
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Relative nuclear abundances inside ISS with Sileye-3/Alteino experiment
- 2006
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Ingår i: Advances in Space Research. - : Elsevier BV. - 0273-1177 .- 1879-1948. ; 37:9, s. 1685-1690
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Tidskriftsartikel (refereegranskat)abstract
- The experiment Sileye-3/Alteino was first operational on board the international Space Station between 27/4 and 1/5/2002. It is constituted of a cosmic ray silicon detector and an electroencephalograph and is used to monitor radiation environment and study the light flash phenomenon in space. As a stand-alone device, Sileye-3/Alteino can monitor in real time cosmic ray nuclei. In this work, we report on relative nuclear abundance measurements in different regions of the orbit for nuclei from B to Fe in the energy range above similar or equal to 60 Mev/n. Abundances of nuclei such as 0 and Ne relative to C are found to be increased in respect to particle composition outside of the station, whereas the Fe group is reduced. This effect could be ascribed to nuclear interactions with the hull of the station.
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| 4. |
- Di Fino, L., et al.
(författare)
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ALTEA data handling
- 2006
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Ingår i: SPACE LIFE SCIENCES: FLIGHT MEASUREMENTS, CALIBRATION OF DETECTORS AND ENVIRONMENTAL MODELS FOR RADIATION ANALYSIS. - : ELSEVIER SCIENCE LTD. ; , s. 1710-1715
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Konferensbidrag (refereegranskat)abstract
- The ALTEA program is an international and multi-disciplinary collaboration aimed at studying particle radiation in space environment and its effects on astronauts, in particular the anomalous perception of Light Flashes. This paper describes ALTEA space facility scheduled to fly in the International Space Station (ISS) after July 2006, what kind of data are produced and how data are transmitted to Earth, processed and analyzed.
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| 5. |
- Larsson, Oscar, et al.
(författare)
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Measurements of heavy-ion anisotropy and dose rates in the Russian section of the International Space Station with the Sileye-3/Alteino detector
- 2015
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Ingår i: Journal of Physics G. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 42:2, s. 025002-
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Tidskriftsartikel (refereegranskat)abstract
- In this work we present data on linear energy transfer (LET), dose and dose equivalent rates from different locations of the Russian part of the International Space Station (ISS) measured by the Sileye-3/Alteino detector. Data were taken as part of the ESA ALTCRISS project from late 2005 through 2007. The LET rate data shows a heavy-ion (LET > 50 keV/mu m) anisotropy. From the heavy-ion LET rate in the Zvezda service module we find ISS (y) over cap (Starboard) and (z) over cap (Nadir) to be about 10-15 times higher than in (x) over cap (Forward). The situation is similar for dose and dose equivalent rates, ranging from 25-40 mu Gy d(-1) in (x) over cap to about 75 mu Gy d(-1) in (z) over cap, whereas for the dose equivalent the rate peaks in (y) over cap with around 470 mu Sv d(-1). The heavy-ion anisotropy confirms what has been reported by the ALTEA collaboration. Measurements using two sets of passive detectors, DLR-TLDs and PADLES (TLD+CR-39), have also been performed in conjunction with Alteino measurements, both shielded and unshielded. The passive detectors register a dose rate about 3-5 times as high as Alteino, 260-280 mu Gy d(-1) for PADLES and 200-260 mu Gy d(-1) for DLR-TLDs. For the dose equivalent PADLES measurements ranges from 560-740 mu Sv d(-1).
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| 6. |
- Narici, L., et al.
(författare)
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Iron flux inside the International Space Station is measured to be lower than predicted
- 2012
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Ingår i: Radiation Measurements. - : Elsevier BV. - 1350-4487 .- 1879-0925. ; 47:10, s. 1030-1034
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Tidskriftsartikel (refereegranskat)abstract
- Iron abundance in cosmic rays impinging on astronauts in space habitats is of paramount importance when calculating the radiation risk for human space exploration. The concurrent high relative abundance of iron in Galactic Cosmic Rays (GCR) and iron ability to produce damages at cellular and molecular levels, together with recent radiobiology results suggests iron as a major candidate to be studied in order to produce accurate radiation hazard assessments. Iron may be in fact responsible for a large percentage of cancer risk during a long interplanetary voyage, and therefore deserves a specific attention. We built a simple model based on CREME96 for the radiation in the International Space Station (ISS) and tested it against recently performed measurements with the ALTEA and Alteino particle detectors. While we can report a good agreement between 50m and 250 keV/μm (very good for several peaks such as Si, Mg, S) we show an overestimation by this model of iron abundances of about 25-80% when compared to the measurements. New analysis on previously published work, supporting this result, are also reported. Reasons for this overestimation are discussed, they are likely to be related to the not detailed enough transport through the multiplicity of the ISS shielding and to the often used simplification of "aluminum equivalent shielding". The iron sources in LEO, possibly not yet accurate enough when transported in Low Earth Orbit, can also play a role. New concurrent measurements (inside-outside the ISS) are suggested to help resolving this issue.
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| 7. |
- Zaconte, V., et al.
(författare)
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ALTEA : flight model calibration at GSI
- 2006
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Ingår i: Advances in Space Research. - : Elsevier BV. - 0273-1177 .- 1879-1948. ; 37:9, s. 1704-1709
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Tidskriftsartikel (refereegranskat)abstract
- The ALTEA project, an international and multi-disciplinary collaboration scheduled to fly in the International Space Station (ISS) after July 2006, is aimed at studying particle radiation in space environment and its effects on astronauts, in particular the anomalous perception of 'light flashes'. In this paper, we present experimental results obtained by testing the Flight Model of the ALTEA particle detector in two measurement sessions performed at the heavy ion accelerator of GSI laboratory in Darmstadt, Germany. Instrument response was compared with Monte-carlo simulations to study its linearity and calculate amplification.
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