Decreasing the Sampling Time Interval in Radioactive Particle Tracking

Abstract

The study of the movement of solids in multiphase reactors using radioactive particle tracking is currently limited to fairly modest particle velocities because of count‐rate limitations of the detection system. In this work, this restriction was overcome by increasing the activity of the radioactive tracer, by decreasing the sampling time interval and by modifying the particle tracking software to recognize which detectors were saturated and to use only the data from the remaining unsaturated detectors. Higher tracer activity resulted in lower standard deviation of the calculated tracer coordinates.

Particle Dynamics in Horizontal Stirred Bed Reactors Characterized by Single-Photon Emission Radioactive Particle Tracking

“…The detector configuration and stochastic nature of radiation result in a Poisson distribution of detection events. The standard deviation of the calculated tracer particle coordinates is inversely proportional to the square root of the sampling time, which is directly proportional to the number of detected events [32]. Increasing the activity of the tracer particle increases the number of detected events, and thus decreases the standard deviation of the calculated coordinates.…”

Experimental methods in chemical engineering: Reactors—fluidized beds

“…[26] APPLICATIONS In 2016 and 2017, fluidized beds appeared in 4135 articles indexed by the Web of Science Core Collection (WoS). [45] VOSViewer generated a bibliometric from the keywords of these articles ( Figure 5) and identified five clusters of research: [46] gasification and pyrolysis (blue), combustion and CO 2 capture Optical probes [27][28][29] fibres immersed in bed calibration problematic Pressure [30][31][32] P Δ between two point applied in industry time-averaged or time-resolved Tomography [33,34] electric capacitance (ECT) fast temporal resolution (dielectric particles) high T or P excluded poor spatial resolution image reconstruction x/γ-ray tomography (RPT) photons travel through bed slower than ECT better spatial resolution than ECT Particle [35][36][37] radioactive particles computer automated (CARPT) tracking [38,39] multiple γ-detectors characterizes 3D beds Optics [40,41] optical, magnetic requires digital image analysis phosphorescent particles Image analysis [42][43][44] particle image velocimetry transparent, 2D, or dilute systems digital image analysis extracts data Figure 5. Bibliometric map of keywords.…”

Strategy for fitting source strength and reconstruction procedure in radioactive particle tracking

“…The impact of the position and orientation of the detectors connected to the specific Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/apradiso experimental conditions and/or restrictions were presented by Dubé et al (2014). The impact of sampling time and source strength on the RPT technique's precision was studied in Mostoufi et al (2003). However, to our knowledge, the influence of the statistical nature of the emission, counting processes and reconstruction procedure on the RPT technique's accuracy has never before been studied.…”