Multiple-arm, centrifugally tensioned, metastable-fluid detector: Assessment and development
Abstract
This thesis describes the research, development, and the assessment of the newly invented Multiple-Arm Centrifugally Tensioned Metastable Fluid Detector (MAC-TMFD). This MAC-TMFD system is compared to the baseline of Centrifugally Tensioned Metastable Fluid Detectors (CTMFDs) as well as to a state-of-the-art Beckman Liquid Scintillation (LS) Detector for the ability to detect fast neutrons, for alpha recoils, and for the discrimination of source spectra. Two of the limitations with current CTMFD designs are the ability to use only one detection fluid at a time and that it is a single-shot system, i.e., one detection event prior to stop and restart. The MAC-TMFD improves on these limitations with enhanced flexibility to use multiple single-arm detectors in one envelop to both increase the number of fluids that can be used and allow for multiple detection per stop and restart. CTMFD technology is discussed leading up to the development of the MAC-TMFD and specific technology improvements to the CTMFD systems are described and contrasted. New wireless mode electronic detection monitoring systems and automation software were developed for the MAC-TMFD's unique needs and are detailed. Neutron detection from random and fission sources with multiple working fluids and different source types are examined and the system was able to discriminate the source with each working fluid. A theoretical model was developed for the estimation of spectrum relevant fast neutron detection efficiency with the MAC-TMFD sensors and was successfully bench marked with data. Gamma insensitivity experiments were conducted using a variety of gamma emitting isotope sources to demonstrate gamma blindness. Alpha decay events were recorded using americium-241 with two different activities. These results for actinide activity detection in the MAC-TMFD were benchmarked and compared with assessments from the Beckman Liquid Scintillation LS 6500 Spectrometer to show the MAC-TMFD's ability to detect at trace levels significantly below what is possible from state or the art systems. Theoretical considerations were made to illustrate detection of neutron collisions and alpha decays. Lastly, recommendations have been made for enabling further improvements as well as applications for a variety of real-world applications for the MAC-TMFD sensor technology.
Degree
M.S.
Advisors
Taleyarkhan, Purdue University.
Subject Area
Nuclear engineering
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