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Full-Text Articles in Engineering
Development Of Novel Cesium Chloride-Based Ultrafast Inorganic Scintillators For Fast Timing Radiation Detection Applications, Daniel Rutstrom
Development Of Novel Cesium Chloride-Based Ultrafast Inorganic Scintillators For Fast Timing Radiation Detection Applications, Daniel Rutstrom
Doctoral Dissertations
Cs2ZnCl4 [dicesium zinc tetrachloride] and Cs3ZnCl5 [tricesium zinc pentachloride] are relatively new scintillator materials that appear to be promising for use in fast-timing radiation detection applications owing to their 1 to 2 nanosecond decay times. Moreover, they offer several advantages over the state-of-the-art ultrafast inorganic scintillator BaF2 [barium fluoride]. To fully realize the potential of these novel materials, growth of crystals having improved optical quality must be demonstrated. The mechanism responsible for the ultrafast decay times, core valence luminescence (CVL), in cesium zinc chloride crystals can also be observed in other compounds containing …
Capabilities Of A Closely-Packed, Wearable Radiation Detector Array: Source Localization, Directionality, And Multi-Modal Data Fusion, Carl Glenn Britt
Capabilities Of A Closely-Packed, Wearable Radiation Detector Array: Source Localization, Directionality, And Multi-Modal Data Fusion, Carl Glenn Britt
Doctoral Dissertations
The capability of assigning source carrier probabilities by fusing both video and radiation data is demonstrated. Potential targets are automatically detected and tracked with computer vision techniques. Meanwhile, a newly developed method for exploiting the angular response of closely-packed radiation detector arrays points towards a radiation source using short, periodic measurements on the order of 1 s. Source carrier probabilities are then assigned after the object's movement measured from the video data stream is correlated with the radiation directionality estimates over a set period of time. In demonstrating source carrier probability assigned to moving sources, three main contributions were made. …
A Datacentric Algorithm For Gamma-Ray Radiation Anomaly Detection In Unknown Background Environments, James M. Ghawaly Jr
A Datacentric Algorithm For Gamma-Ray Radiation Anomaly Detection In Unknown Background Environments, James M. Ghawaly Jr
Doctoral Dissertations
The detection of anomalous radioactive sources in environments characterized by a high level of variation in the background radiation is a challenging problem in nuclear security. A variety of natural and artificial sources contribute to background radiation dynamics including variations in the absolute and relative concentrations of naturally occurring radioisotopes in different materials, the wet-deposition of $^{222}$Rn daughters during precipitation, and background suppression due to physical objects in the detector scene called ``clutter." This dissertation presents a new datacentric algorithm for radiation anomaly detection in dynamic background environments. The algorithm is based on a custom deep neural autoencoder architecture called …
Discovery And Development Of Rare Earth Activated Binary Metal Halide Scintillators For Next Generation Radiation Detectors, Kan Yang
Doctoral Dissertations
This work focuses on discovery and development of novel binary halide scintillation materials for radiation detection applications. A complete laboratory for raw materials handling, ampoule preparation, material rapid synthesis screening, single crystal growth, sample cutting, polishing and packaging of hygroscopic halide scintillation materials has been established. Ce3+ and Eu2+ activated scintillators in three binary systems: Alkali Halide – Rare Earth Halide (AX–REX3), Alkali Halide – Alkaline Earth Halide (AX–AEX2) and Alkalin Earth Halide – Rare Earth Halide (AEX2–REX3) were systematically studied. Candidates for new scintillation materials in the three systems …