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https://hdl.handle.net/2142/70907
Description
Title
The Kinetics of Neutralization of Polonium-218
Author(s)
Chu, Kai-Dee
Issue Date
1987
Department of Study
Nuclear Engineering
Discipline
Nuclear Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Environmental Sciences
Abstract
In a well-defined experimental system the neutralization of polonium-218 ions was investigated as a function of the physical and chemical properties of the controlled composition atmosphere. The mobilities of ${\rm Po}\sp+$ and ${\rm PoO}\sbsp{2}{+}$ are determined by combining experimental results with a computer model of the system. Three neutralization mechanisms were individually studied. The small ion recombination rate has been found to be proportional to the square root of radon concentration. The electron scavenging mechanism is responsible for the neutralization of ${\rm Po}\sp+$ in ${\rm NO}\sb2$ or ${\rm H\sb2O}$ in nitrogen. When ${\rm PoO}\sbsp{2}{+}$ is formed, the electron transfer mechanism dominates the neutralization process. The electron is transferred to ${\rm PoO}\sbsp{2}{+}$ from molecules with lower ionization potentials. The ionization potential of ${\rm PoO}\sbsp{2}{+}$ is also determined to be 10.44 $\pm$ 0.05 eV.
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