Differential neutron energy spectra measured on spacecraft in low Earth orbit
Two methods for measuring neutrons in the range from thermal energies to dozens of MeV were used. In the first method, alpha-particles emitted from the 6Li(n,alpha)T reaction are detected with the help of plastic nuclear track detectors, yielding results on thermal and resonance neutrons. Also, fi...
| Veröffentlicht in: | International Journal Of Radiation Applications And Instrumentation. Part D, Nuclear Tracks And Radiation Measurements. - 1990. - 17(1990), 2 vom: 07., Seite 87-91 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
1990
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| Zugriff auf das übergeordnete Werk: | International Journal Of Radiation Applications And Instrumentation. Part D, Nuclear Tracks And Radiation Measurements |
| Schlagworte: | Comparative Study Journal Article Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. NASA Discipline Number 00-00 NASA Discipline Number 04-10 NASA Discipline Radiation Health NASA Program Flight NASA Program Radiation Health Non-NASA Center |
| Zusammenfassung: | Two methods for measuring neutrons in the range from thermal energies to dozens of MeV were used. In the first method, alpha-particles emitted from the 6Li(n,alpha)T reaction are detected with the help of plastic nuclear track detectors, yielding results on thermal and resonance neutrons. Also, fission foils are used to detect fast neutrons. In the second method, fast neutrons are recorded by nuclear photographic emulsions (NPE). The results of measurements on board various satellites are presented. The neutron flux density does not appear to correlate clearly with orbital parameters. Up to 50% of neutrons are due to albedo neutrons from the atmosphere while the fluxes inside the satellites are 15-20% higher than those on the outside. Estimates show that the neutron contribution to the total equivalent radiation dose reaches 20-30% |
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| Beschreibung: | Date Completed 10.05.1995 Date Revised 05.11.2019 published: Print Citation Status MEDLINE |
| ISSN: | 0735-245X |