Masters Theses

Date of Award

5-2015

Degree Type

Thesis

Degree Name

Master of Science

Major

Biomedical Engineering

Major Professor

Jacqueline A. Johnson

Committee Members

Dustin Osborne, Justin Baba

Abstract

Borate silica glass ceramics were produced for neutron scintillation. The Glass ceramics were doped with europium fluoride [EuF2] and cerium chloride [CeCl3]. Isotopic lithium fluoride [6LiF] and boron oxide [10B2O3] were used in most samples while non-isotopic lithium fluoride [LiF] and boron oxide [ B2O3] were used in the rest. When exposed to a neutron beam, samples doped with europium fluoride [EuF2] scintillated while samples doped with cerium chloride [CeCl3] did not. This contradicts current literature on fast scintillation. What is even more significant is that with europium fluoride [EuF2] as a dopant, isotopes were not necessary for scintillation results. Eliminating isotopes from the glasses heavily reduces their production cost. This would introduce a high quality, fast scintillator into the market without the expense of isotopes. This has great potential for homeland security, maintenance and safety of nuclear production and storage facilities, and even transportation safety.

ZBLAN glass ceramics were produced for medical imaging. The primary goal was to further investigate crystalline phase transformations of barium chloride [BaCl2]. The phases are important because they determine how the glass ceramic behaves. Hexagonal glasses act as scintillators, orthorhombic phase barium chloride [BaCl2] behave as storage phosphors, and an unknown phase may a ect the properties of both. Samples were made and characterized using Differential Scanning Calorimetry, in-situ X-Ray Diffraction, and Phosphorimetry. We found that defects created in the glass ceramics are important to how the crystals form.

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