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Title page for ETD etd-03292017-001124


Type of Document Dissertation
Author Mayo, Daniel Craig
Author's Email Address daniel.c.mayo@vanderbilt.edu
URN etd-03292017-001124
Title Zinc Oxide Nanowire Gamma-Ray Detector with High Spatiotemporal Resolution
Degree PhD
Department Interdisciplinary Materials Science
Advisory Committee
Advisor Name Title
Richard F. Haglund Jr. Committee Chair
Timothy P. Hanusa Committee Co-Chair
D. Greg Walker Committee Member
Richard R. Mu Committee Member
Robert A. Reed Committee Member
Keywords
  • nanowire
  • zinc oxide
  • zno
  • scintillator
  • radiation detector
Date of Defense 2016-08-18
Availability unrestricted
Abstract
This research is focused on developing a new type of gamma-ray scintillator and is motivated by the need for more accurate positron emission tomography (PET) imaging. PET scans are used to display regions of high-metabolic activity within the body and can indicate the presence of tumors, so clear images are essential for accurate diagnoses and treatment options. Scintillation detectors currently used for PET scans typically have a time resolution of hundreds of ps that yields images with poorly defined and blurred boundaries. Conversely, ZnO nanowires have a response time that is an order of magnitude faster with the potential for an analogous improvement to spatial resolution. Moreover, initial experiments show ZnO nanowires are radiation hardened with highly transient lattice defects. To optimize overall scintillator efficiency, the emission can be enhanced through a combination of optical-cavity effects (15x enhancement) and plasmon-exciton coupling (3x enhancement), while the low interaction volume of the nanowires can be addressed by adding a high-Z backing layer to attenuate incoming gamma rays. The ability to decouple, and address separately, emission efficiency and gamma-ray interaction provides a unique materials workbench and establishes ZnO nanowires as a highly promising PET scan scintillator material.
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