Secondary-Particle Production in Organic Material by Cosmic Rays: Simulations and CRaTER Observations

Details Secondary-Particle Production in Organic Material by Cosmic Rays: Simulations and CRaTER Observations Secondary-Particle Production in Organic Material by Cosmic Rays: Simulations and CRaTER Observations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.u31b0025l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #U31B-0025

Physics

[2104] Interplanetary Physics / Cosmic Rays, [5421] Planetary Sciences: Solid Surface Planets / Interactions With Particles And Fields, [7938] Space Weather / Impacts On Humans, [7984] Space Weather / Space Radiation Environment

Scientific paper

It is well known that material between a radiation environment and a sensitive target, whether the target is an electronic device or living tissue, can enhance the dose received by the target instead of shielding it, depending on the characteristics of the material and of the radiation. The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) aboard the Lunar Reconnaissance Orbiter (LRO) is designed to measure this effect on the dose that would be received from the space radiation environment by an astronaut on or near the lunar surface. In between its silicon solid-state detectors are two pieces of Tissue-Equivalent Plastic (TEP) with a density and composition similar to muscle tissue, in which interacting primary cosmic-ray nuclei will produce secondary particles that increase dose in an underlying target beyond the base LET of the cosmic-ray particle itself. We will present results of Geant4 simulations of this effect given an incident cosmic-ray spectrum, and will compare those results with observations from CRaTER's first months in lunar orbit.

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