CRaTER: The Cosmic Ray Telescope for the Effects of Radiation Experiment on the Lunar Reconnaissance Orbiter Mission
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The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) on the Lunar Reconnaissance Orbiter (LRO) characterizes the radiation environment to be experienced by humans during future lunar missions. CRaTER measures the effects of ionizing energy loss in matter due to penetrating solar energetic protons (SEP) and galactic cosmic rays (GCR), specifically in silicon solid-state detectors and after interactions with tissue-equivalent plastic (TEP), a synthetic analog of human tissue. The CRaTER investigation quantifies the linear energy transfer (LET) spectrum in these materials through direct measurements with the lunar space radiation environment, particularly the interactions of ions with energies above 10 MeV, which penetrate and are detected by CRaTER. Combined with models of radiation transport through materials, CRaTER LET measurements constrain models of the biological effects of ionizing radiation in the lunar environment as well as provide valuable information on radiation effects on electronic systems in deep space. In addition to these human exploration goals, CRaTER measurements also provide new insights on the spatial and temporal variability of the SEP and GCR populations and their interactions with the lunar surface. We present here an overview of the CRaTER science goals and investigation, including: an instrument description; observation strategies; instrument testing, characterization, and calibration; and data analysis, interpretation, and modeling plans.
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- J.B. Blake, J.F. Fennell, L.M. Friesen, B.M. Johnson, W.A. Kolasinski, D.J. Mabry, J.V. Osborn, S.H. Penzin, E.R. Schnauss, H.E. Spence, D.N. Baker, R. Belian, T.A. Fritz, W. Ford, B. Laubscher, R. Stiglich, R.A. Baraze, M.F. Hilsenrath, W.L. Imhof, J.R. Kilner, J. Mobilia, H.D. Voss, A. Korth, M. Güll, K. Fischer, M. Grande, D. Hall, CEPPAD: comprehensive energetic particle and pitch angle distribution experiment on POLAR. Space Sci. Rev. 71, 531 (1995) CrossRefADSGoogle Scholar
- E.W. Cascio, J.M. Sisterson, J.B. Flanz, M.S. Wagner, The proton irradiation program at the Northeast Proton Therapy Center, in NSREC Proceedings (2003) Google Scholar
- E.W. Cascio, J.M. Sisterson, B. Gottschalk, S. Sarkar, Measurements of the energy spectrum of degraded proton beams at NPTC, in NSREC Proceedings (2004) Google Scholar
- Y.M. Charara, Characterization of the cosmic ray telescope for the effects of radiation (CRaTER) detector. PhD Dissertation, The University of Tennessee, Knoxville, Tennessee, December 2008 Google Scholar
- Y. Kim, J.W. Wilson, S.A. Thibeault, J.E. Nealy, F.F. Badavi, R.L. Kiefer, Performance study of galactic cosmic ray shield materials, NASA Technical Paper 3473, November 1994 Google Scholar
- T. Mulligan, J.B. Blake, D. Shaul, J.J. Quenby, R.A. Leske, R.A. Mewaldt, M. Galametz, Short-period variability in the galactic cosmic ray intensity: high statistical resolution observations and interpretation around the time of a Forbush decrease in August 2006. J. Geophys. Res. 114, A07105 (2009). doi: 10.1029/2008JA013783 CrossRefGoogle Scholar
- T.J. Stubbs, R.R. Vondrak, W.M. Farrell, Impact of dust on lunar exploration, in Proceedings of Dust in Planetary Systems 2005, ed. by H. Kruger, A. Graps (Eur. Space Agency Spec. Publ., 2007) Google Scholar
- J.W. Wilson, F.F. Badavi, F.A. Cucinotta, J.L. Shinn, G.D. Badhwar, R. Silberberg, C.H. Tsao, L.W. Townsend, R.K. Tripathi, HZETRN: Description of a free-space ion and nucleon transport and shielding computer program. NASA Technical Paper 3495, US Government Printing Office, Washington, DC, 1995 Google Scholar
- R.M. Winglee, E.M. Harnett, Radiation mitigation at the moon by the terrestrial magnetosphere, Geophys. Res. Lett. 34 (2007). doi: 10.1029/2007GL030507
- J.F. Ziegler, J.P. Biersack, U. Littmark, The Stopping and Range of Ions in Solids, vol. 1 (Pergamon Press, New York, 1984) Google Scholar