| 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 |
|
| Keywords |
- 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 |
Abstract
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.
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
| |
Hill_Jr_thesis.pdf |
3.90 Mb |
00:18:02 |
00:09:16 |
00:08:07 |
00:04:03 |
00:00:20 |
|
