Parametric Study of Beta-Endpoint Energy in Direct Energy Converters

Report No. ARL-TR-4034
Authors: Kara Blaine and Marc Litz
Date/Pages: January 2007; 60 pages
Abstract: Several solid-state materials have been identified for potential use as direct-energy-converter (DEC) for isotope-based batteries. Numerical simulations, using a nuclear scattering code (MCNPX), have been performed to determine the electron energy deposited in the material. Two different parametric studies were performed 1) varying ?-endpoint energy of a spectrum illuminating layers of silicon-carbide (SiC), 2) the other varying the material layers while keeping the ?-endpoint energy constant. The goal of the simulations is to identify the regions within the materials of maximum energy deposition so DEC devices can be fabricated for higher efficiency. The results show that 50 keV and 100 keV ?-endpoint energies stand to have most impact to future Schottky devices, generating the largest number density of carriers, and highest energy deposition efficiency in the first 10 ?m of SiC.
Distribution: Approved for public release
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Last Update / Reviewed: January 1, 2007