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Advancements in Networked Radiation Sensor Systems for Enhanced Detection and Localization

This workshop explores the efficacy of a networked system of portable radiation detectors compared to individual detectors. Led by Dr. Richard Vojtech from the Domestic Nuclear Detection Office, the session focuses on whether collective data from multiple sensors can improve the detection, localization, and identification of anomalous radioactive materials. Key questions include the performance comparison between networked and individual systems, strengths and weaknesses of each approach, and identification of scenarios benefiting from improved networking. Initial results indicate networking enhances detection capabilities and reduces false alarms.

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Advancements in Networked Radiation Sensor Systems for Enhanced Detection and Localization

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  1. Networking Radiation Sensor SystemsNITRD WorkshopSeptember 20, 2012 Richard Vojtech, Ph.D. Principal Deputy Assistant Director Transformational and Applied Research Directorate Domestic Nuclear Detection Office

  2. The Questions • Will a networked system of portable radiation detectors outperform the same number of individual detector operating independently? • Will the networked system improve the ability to: • detect anomalous radioactive materials? • locate the materials? • identify the materials?

  3. The Program Goal • To demonstrate advanced technologies that improve the ability to detect, localize, and identifyradiological sources by combining data from multiple radiation detector nodes. • Key Questions: • How does the performance of the ensemble compare to that of the • individual detectors? • What are the strengths and weaknesses of each system approach? • Do trends in the data suggest which types of scenarios will • benefit the most from a tightly coupled network?

  4. “Intelligent” Radiation Sensor System Data Packet ~1 Hz Advanced algorithms combine the radiation, spatial, and temporal information from multiple sensors to make a collective assessment about the presence and location of radiological sources Sensor Array • Energy Spectrum • Sensor Position/Orientation • Timestamp N1 N2 Wireless Comms N5 N3 N4

  5. Detector Devices Smiths Detection General Electric Passport Systems

  6. System Characterization background step area Detector Pattern: Spiral + Rings Movable Track command trailers Subsetting 2 rings 6 quadrilaterals 7 triangles 2”x2” NaI (18) open “field” area Alt DD (4) Subsets 2 rings 6 quadrilaterals 7 triangles

  7. Initial Impressions from a Networked System • In simple cases IRSS shows benefits of networking for detection and agrees well with theoretical expectations • Networking can provide reduction in false alarms at the system level compared to a collection of individual sensors • Tracking of moving sources (even with a single sensor) was achieved with non-directional sensors

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