Doctoral Dissertations

Date of Award

12-2004

Degree Type

Dissertation

Degree Name

Doctor of Philosophy

Major

Nuclear Engineering

Major Professor

Lawrence W. Townsend

Committee Members

Ronald E. Pevey, Arthur E. Ruggles, Thomas Handler

Abstract

To correctly specify the composition and spectra of heavy ion radiation fields, such as those encountered in space radiation protection studies, as they are transported through shielding, accurate values of the total, elastic scattering, and reaction cross sections, spectral distributions and angular distributions of all emitted particles (nucleons, light ions and heavy ions) from the nuclear interactions of propagating high energy heavy ion (HZE) particles with target nuclei are required. For space radiation protection studies, this means that double-differential (energy and angle) isotope production cross sections must be known for all stable nuclear isotopes with mass numbers from 1 to about 60 colliding with any target nucleus at energies from tens of MeV per nucleon up to several GeV per nucleon. With this cross section database, transport codes would be able to transport nearly any radiation field that man or machine might be exposed to in space or otherwise. This database is the first high speed comprehensive database suitable for three dimensional radiation transport. Once the comprehensive database was completed, it was incorporated into HETC to create a generalized, three dimensional radiation transport code, HETC-HEDS for space applications.

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