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.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-11142007-230454 |
| Date | 16 November 2007 |
| Creators | Hill Jr., William H. |
| Contributors | Erno Sajo, Kenneth Matthews, Michael Cherry, Wei-Hsung Wang |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-11142007-230454/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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