Open Access Theses and Dissertations

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You searched for +publisher:"Oregon State University" +contributor:("Farsoni, Abdollah T."). Showing records 1 – 3 of 3 total matches.

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Oregon State University

1. Cazalas, Edward J. Design, construction, and analysis of a skin contamination dosimeter.

Degree: MS, Nuclear Engineering, 2009, Oregon State University

URL: http://hdl.handle.net/1957/13587 

International recommendations provided by the International Commission on Radiation Protection (ICRP), as well as national regulations, set by the U.S. Nuclear Regulatory Commission (NRC), state that the exposure of skin to highly concentrated radioactive sources should be monitored at specified depths in skin and kept below specific dose equivalence levels. In this work, a prototypic skin contamination dosimeter designed for dose verification and compliance, as described in the Code of Federal Regulations (10CFR20), is designed, constructed, characterized, and calibrated. The dosimeter is modeled and compared against Monte Carlo Nth Particle version 5 particle transport code simulations. The detection of radiation is carried out with scintillation layers intended to give an absolute measure of absorbed dose to the shallow, and deep layers of skin, as well as to the lens of the eye and a layer in skin biologically significant in stochastic effects. The scintillation layers are installed into a scintillation assembly, which provides a tissue-equivalent medium for radiation interactions. Advisors/Committee Members: Hamby, David M. (advisor), Farsoni, Abdollah T. (committee member).

Subjects/Keywords: Radioactive; Dosimeters  – Design and construction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cazalas, E. J. (2009). Design, construction, and analysis of a skin contamination dosimeter. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/13587

Chicago Manual of Style (16th Edition):

Cazalas, Edward J. “Design, construction, and analysis of a skin contamination dosimeter.” 2009. Masters Thesis, Oregon State University. Accessed January 22, 2021. http://hdl.handle.net/1957/13587.

MLA Handbook (7th Edition):

Cazalas, Edward J. “Design, construction, and analysis of a skin contamination dosimeter.” 2009. Web. 22 Jan 2021.

Vancouver:

Cazalas EJ. Design, construction, and analysis of a skin contamination dosimeter. [Internet] [Masters thesis]. Oregon State University; 2009. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1957/13587.

Council of Science Editors:

Cazalas EJ. Design, construction, and analysis of a skin contamination dosimeter. [Masters Thesis]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/13587

2. Alhawsawi, Abdulsalam M. Study of Compton suppression capability in a triple-layer phoswich detector.

Degree: MS, Radiation Health Physics, 2011, Oregon State University

URL: http://hdl.handle.net/1957/22822 

A triple layer phoswich detector was designed and assembled in the advanced radiation instrumentation lab at Oregon State University. The detector had three scintillation layers: the first one was a BC-400 for beta and conversion electron detection, the second layer was a CsI(Tl) for x-ray and gamma detection, and the third layer was BGO for shielding the CsI(Tl) crystal from background radiation and identifying scattered photons from the CsI(Tl) layer. Digital pulse processing was utilized to analyze pulses at a 200 MHz sampling rate. Pulses were analyzed according to their light decay time. The detector was able to suppress Compton events in low energy spectrum through pulse shape analysis. Suppression factors were calculated at the 90 keV and 250 keV regions in the ¹³⁷Cs gamma ray spectrum. Compton suppression capability reduced the Compton continuum at 90 keV region, and at 250 keV region by a factor of 56.5%, and 68.3%, respectively. Advisors/Committee Members: Farsoni, Abdollah T. (advisor), Hamby, David M. (committee member).

Subjects/Keywords: phoswich

…instrumentation lab at Oregon State University. The detector had three… …A THESIS Submitted to Oregon State University in… …will become part of the permanent collection of Oregon State… …University libraries. My signature below authorizes release of my… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alhawsawi, A. M. (2011). Study of Compton suppression capability in a triple-layer phoswich detector. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/22822

Chicago Manual of Style (16th Edition):

Alhawsawi, Abdulsalam M. “Study of Compton suppression capability in a triple-layer phoswich detector.” 2011. Masters Thesis, Oregon State University. Accessed January 22, 2021. http://hdl.handle.net/1957/22822.

MLA Handbook (7th Edition):

Alhawsawi, Abdulsalam M. “Study of Compton suppression capability in a triple-layer phoswich detector.” 2011. Web. 22 Jan 2021.

Vancouver:

Alhawsawi AM. Study of Compton suppression capability in a triple-layer phoswich detector. [Internet] [Masters thesis]. Oregon State University; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1957/22822.

Council of Science Editors:

Alhawsawi AM. Study of Compton suppression capability in a triple-layer phoswich detector. [Masters Thesis]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/22822

3. Alemayehu, Bemnet. Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring.

Degree: PhD, Radiation Health Physics, 2013, Oregon State University

URL: http://hdl.handle.net/1957/42388 

Radioxenon detection is a technique used to monitor nuclear explosion and verify the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Because of an ultra-low concentration of radioxenon at radioxenon monitoring stations, radioxenon detection systems must have high sensitivity. This sensitivity is measured in terms of detector's minimum detectable concentration (MDC). It is required that radioxenon monitoring systems should have a MDC of less than or equal to 1 mBq/m³ for ¹³³Xe. A Well-type Actively Shielded Phoswich Detector (WASPD) for radioxenon detection was designed and assembled at the Radiation Detection and Dosimetry lab at Oregon State University. The active shielding mechanism is integrated into the phoswich detector to improve the MDC of the radioxenon by reducing unwanted background events. Anode pulses were processed using a user programmable digital pulse processor. All digital processing functions were implemented in a FPGA device in real-time. The detector was characterized for different radioxenon isotopes. MDC calculation of the detector showed that the results are close or below 1 mBq/m³ for all radioxenon isotopes. Advisors/Committee Members: Farsoni, Abdollah T. (advisor), Hamby, David M. (committee member).

Subjects/Keywords: Digital pulse shape discrimination; Xenon  – Isotopes  – Measurement

…activating highly enriched stable xenon gas at the TRIGA reactor of the Oregon State University… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alemayehu, B. (2013). Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/42388

Chicago Manual of Style (16th Edition):

Alemayehu, Bemnet. “Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring.” 2013. Doctoral Dissertation, Oregon State University. Accessed January 22, 2021. http://hdl.handle.net/1957/42388.

MLA Handbook (7th Edition):

Alemayehu, Bemnet. “Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring.” 2013. Web. 22 Jan 2021.

Vancouver:

Alemayehu B. Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring. [Internet] [Doctoral dissertation]. Oregon State University; 2013. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1957/42388.

Council of Science Editors:

Alemayehu B. Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring. [Doctoral Dissertation]. Oregon State University; 2013. Available from: http://hdl.handle.net/1957/42388

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