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CRaTER: The Cosmic Ray Telescope for the Effects of Radiation Experiment on the Lunar Reconnaissance Orbiter Mission
Spence, H. E.; Case, A. W.; Golightly, M. J.; Heine, T.; Larsen, B. A.; Blake, J. B.; Caranza, P.; Crain, W. R.; George, J.; Lalic, M.; Lin, A.; Looper, M. D.; Mazur, J. E.; Salvaggio, D.; Kasper, J. C.; Stubbs, T. J.; Doucette, M.; Ford, P.; Foster, R.; Goeke, R.; Gordon, D.; Klatt, B.; O'Connor, J.; Smith, M.; Onsager, T.; Zeitlin, C.; Townsend, L. W.; Charara, Y.
AA(Boston University), AB(Boston University), AC(Boston University), AD(Boston University), AE(Boston University), AF(The Aerospace Corporation), AG(The Aerospace Corporation), AH(The Aerospace Corporation), AI(The Aerospace Corporation), AJ(The Aerospace Corporation), AK(The Aerospace Corporation), AL(The Aerospace Corporation), AM(The Aerospace Corporation), AN(The Aerospace Corporation), AO(Harvard-Smithsonian Center for Astrophysics), AP(University of Maryland, Baltimore County), AQ(Massachusetts Institute of Technology), AR(Massachusetts Institute of Technology), AS(Massachusetts Institute of Technology), AT(Massachusetts Institute of Technology), AU(Massachusetts Institute of Technology), AV(Massachusetts Institute of Technology), AW(Massachusetts Institute of Technology), AX(Massachusetts Institute of Technology), AY(NOAA Spaceweather Prediction Center), AZ(Southwest Research Institute), BA(University of Tennessee), BB(University of Tennessee)
Space Science Reviews, Volume 150, Issue 1-4, pp. 243-284 (SSRv Homepage)
Publication Date:
LRO, Galactic cosmic rays, Solar energetic protons, Radiation effects, LET spectrum, Lunar science
Bibliographic Code:


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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