Mitigation of the radioxenon memory effect in beta-gamma detector systems by deposition of thin film diffusion barriers on plastic scintillator

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Title: Mitigation of the radioxenon memory effect in beta-gamma detector systems by deposition of thin film diffusion barriers on plastic scintillator
Author: Fay, Alexander Gary
Abstract: The significance of the radioxenon memory effect in the context of the International Monitoring System of the Comprehensive Nuclear -Test -Ban Treaty is introduced as motivation for the project . Existing work regarding xenon memory effect reduction and thin film diffusion barriers is surveyed . Experimental techniques for radioxenon production and exposure , as well as for thin film deposition on plastic by plasma enhanced chemical vapor deposition (PECVD ) , are detailed . A deposition rate of 76 .5 nm min⁻¹ of SiO₂ is measured for specific PECVD parameters . Relative activity calculations show agreement within 5 % between identically exposed samples counted on parallel detectors . Memory effect reductions of up to 59±1 .8 % for 900 nm SiO₂ films produced by plasma enhanced chemical vapor deposition and of up to 77±3 .7 % for 50 nm Al₂O₃ films produced by atomic layer deposition are shown . Future work is suggested for production of more effective diffusion barriers and expansion to testing in operational monitoring stations .
URI: http : / /hdl .handle .net /2152 /ETD -UT -2010 -12 -2305
Date: 2011-02-16

Citation

Mitigation of the radioxenon memory effect in beta-gamma detector systems by deposition of thin film diffusion barriers on plastic scintillator. Master's thesis, University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /ETD -UT -2010 -12 -2305 .

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