Directional neutron surveys on a semiautonomous mobile robot for a radiological vault

dc.contributor.advisorLandsberger, Sheldon
dc.contributor.advisorVaidya, Rajendra, Ph. D.
dc.contributor.committeeMemberCharlton, WIlliam
dc.contributor.committeeMemberHaas, Derek
dc.contributor.committeeMemberKornreich, Drew
dc.contributor.committeeMemberPryor, Mitch
dc.creatorBrabec, Cheryl Lynn
dc.date.accessioned2021-05-05T04:14:06Z
dc.date.available2021-05-05T04:14:06Z
dc.date.created2020-05
dc.date.issued2020-04-01
dc.date.submittedMay 2020
dc.date.updated2021-05-05T04:14:06Z
dc.description.abstractMonitoring of stored nuclear materials is time consuming and can expose human workers to high levels of radiological risk. The use of robotics in the nuclear complex has the ability to provide increased monitoring while lowering dose. Radiation detectors are essential tools for assessing the hazards present in everyday work and need to be incorporated with robotic systems. However, since there are often many materials collocated in storage areas, the ability to determine the direction and thus source of radiation in a crowded room would provide a better understanding of where the radiological hazards are. A Bridgeport Instruments boron-10 neutron scintillator detector was well characterized to determine inherent directional dependencies. Modeling of a neutron shield to create an artificial aperture around the neutron detector was performed in MCNP. Once the shielding was fabricated, the performance of the aperture was evaluated with a Cf-252 neutron source. The shielding resulted in a maximum 21.75% difference in radiation coming directly through the aperture versus from a different direction. A Pioneer LX robot was successfully approved for operation in the main plutonium facility at Los Alamos National Laboratory. The neutron detector was integrated with a Waypoint Robotics Vector platform, and performed an autonomous survey of storage containers with sealed radioactive sources. This work has been reviewed and issued LANL LA-UR-19-31470.
dc.description.departmentMechanical Engineering
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2152/85554
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/12518
dc.language.isoen
dc.subjectRadiological storage
dc.subjectRobotics
dc.subjectSpecial nuclear materials
dc.subjectNeutron detection
dc.subjectRadiation survey
dc.titleDirectional neutron surveys on a semiautonomous mobile robot for a radiological vault
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentMechanical Engineering
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
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