Progress in the development of a portable phoswich-style skin contamination dosimeter Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/m039k8339

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  • The Code of Federal Regulations (10CFR20.1201) mandates occupational dose limits to the shallow, lens and deep tissue layers. The NRC-accepted procedure of estimating dose to these layers from contamination events is laborious. The current work aims to further the development of a portable phoswich-style skin dosimeter that will operate in real-time to determine dose to these tissue layers. A small dosimeter was designed, constructed, calibrated and tested. A hybrid pulse shape discrimination method and energy calibration technique for the three scintillation layers (BC-400, BC-444 and CaF₂) was developed. Measurements were compared against Monte Carlo (MCNP5) and deterministic (VARSKIN 5) simulations, and generally yielded results within 30% for the lens and deep layers. The current setup consists of a Field Programmable Gate Array (FPGA) based oscilloscope, with pulse shape discrimination and deposition measurements performed with the aid of a MATLAB algorithm. The system has a long system dead time which should be eliminated following application on an FPGA format.
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  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2013-07-26T20:00:09Z (GMT) No. of bitstreams: 1 TangMatthewM2013.pdf: 1986523 bytes, checksum: a1a11e280be3ce8f7faa3ec95e7fc1bb (MD5)
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  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2013-07-26T16:21:28Z (GMT) No. of bitstreams: 1 TangMatthewM2013.pdf: 1986523 bytes, checksum: a1a11e280be3ce8f7faa3ec95e7fc1bb (MD5)
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