| タイトル | Space Radiation Risk Assessment for Future Lunar Missions |
| 本文（外部サイト） | http://hdl.handle.net/2060/20070016627 |
| 著者（英） | Ponomarev, Artem; Kim, Myung-Hee Y.; Atwell, Bill; Cucinotta, Francis A. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2007-07-12 |
| 言語 | eng |
| 内容記述 | For lunar exploration mission design, radiation risk assessments require the understanding of future space radiation environments in support of resource management decisions, operational planning, and a go/no-go decision. The future GCR flux was estimated as a function of interplanetary deceleration potential, which was coupled with the estimated neutron monitor rate from the Climax monitor using a statistical model. A probability distribution function for solar particle event (SPE) occurrence was formed from proton fluence measurements of SPEs occurred during the past 5 solar cycles (19-23). Large proton SPEs identified from impulsive nitrate enhancements in polar ice for which the fluences are greater than 2 10(exp 9) protons/sq cm for energies greater than 30 MeV, were also combined to extend the probability calculation for high level of proton fluences. The probability with which any given proton fluence level of a SPE will be exceeded during a space mission of defined duration was then calculated. Analytic energy spectra of SPEs at different ranks of the integral fluences were constructed over broad energy ranges extending out to GeV, and representative exposure levels were analyzed at those fluences. For the development of an integrated strategy for radiation protection on lunar exploration missions, effective doses at various points inside a spacecraft were calculated with detailed geometry models representing proposed transfer vehicle and habitat concepts. Preliminary radiation risk assessments from SPE and GCR were compared for various configuration concepts of radiation shelter in exploratory-class spacecrafts. |
| NASA分類 | Space Radiation |
| 権利 | Copyright, Distribution under U.S. Government purpose rights |
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