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<p>With the absence of nuclear weapons testing there has been an increase in the reliance on simulation and  modeling for the analysis of nuclear weapons effects. The principal objective of this dissertation was to develop a  particle code for modeling the spatial distribution and temporal decay of ionized fission fragments and beta-decay  electrons injected into the magnetic field of the earth. No known code existed for this explicit purpose. The code  provides a robust, realistic computational capability to predict the persistent radiation environment produced for  such an injection (most likely due to a nuclear detonation at high altitudes) into L-shells less than 1.5. The code  can also be used to produce a source term for the weapons debris from a nuclear detonation at any high altitude  location. Using the model, several of the free parameters are examined and reported to highlight the sensitivity of  the persistent environment to the initial conditions fission fragment release. The parameters examined and reported  here include the effects of ion release location (longitude, latitude, and altitude), the charge state of the fission  fragments, the beta decay half-life, the initial pitch angle of the fission fragments, and the significance of neutral  fission fragments. Additionally, the effects of the magnetic bubble on the dispersion and trapping efficiency of the  particles is studied and reported.
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<br>Subjects: Magnetic bubbles.</div>
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Cross, Christopher Gene.</div>
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