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Weed, Ryan
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article
Simulation and Experimental Analysis of Aerogel Attenuation for High Energy Alpha Particles in Fission Fusion Fragment Rocket Applications
Abstract
Emerging studies are geared toward exploring new methods of nuclear rocket propulsion to provide more efficient space transit beyond Earth's orbit. One method is to employ a Fission Fragment Rocket Engine utilizing fissionable layers embedded in a low-density aerogel. A quantitative understanding of particle attenuation is necessary to develop a working prototype that permits the fission fragments to escape the layers and contribute to the specific impulse rather than being attenuated and contributing to waste heat. In this study, the Monte Carlo n-Particle transport code was utilized to theoretically investigate the attenuation of alpha particles from Am-241 sources within aerogel materials. Simulations explored aerogels of varied densities and various carbonaceous and silicon-based materials. The simulations were used to predict the anticipated alpha particle intensity reaching a detector. Columbia Resin No. 39, CR-39, was used as a Plastic Nuclear Track Detector PNTD and was employed to experimentally analyze the particle attenuation by the aerogels.