Title page for ETD etd-11142007-230454

Type of Document Master's Thesis
Author Hill Jr., William H.
URN etd-11142007-230454
Title Experimental Investigation of an Electronically Collimated Radiation Detector for Location of Gamma-Ray Sources
Degree Master of Science (M.S.)
Department Physics & Astronomy
Advisory Committee
Advisor Name Title
Kenneth Matthews Committee Chair
Erno Sajo Committee Member
Michael Cherry Committee Member
Wei-Hsung Wang Committee Member
  • photon transport
  • monte carlo
  • backprojection
  • portable detector
  • hand held detector
  • czt
  • direction finding
  • gamma ray detection
  • xray detection
  • prototype
  • compton
  • electronic collimation
  • free monte
Date of Defense 2007-10-22
Availability unrestricted
A electronically collimated prototype detector was built with commercially available cadmium zinc telluride (CZT) modules and assessed by experiment and simulation. Sensitivity was roughly equivalent to a common hand held 1"x1" NaI(Tl) detector. The maximum useful count rate was 300 counts per second (cps) per module. Overall angular error was less than 7, which is generally less than source placement uncertainty, and angular resolution was between 20 and 40 for several common isotopes with photon energies between 511 keV and 1333 keV. Prototype data and backprojections were used to verify a simple three dimensional model of charge induction in pixellated CZT using an uncollided flux Monte Carlo code. The goal was to devise a hand held radiation detector that can be made with rugged and commercially available parts that can see a 0.1 mCi source with an energy range of 70 keV to 2 MeV at three meters distance with an annular resolution of less than 25 full width at half maximum (FWHM). The prototype lacked sensitivity to meet this stringent goal but proved the modules and prototype concept useful for a variety of health physics applications.
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