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Detecting Nuclear Materials in Urban Environments Using Mobile Sensor Networks.

Robert R Flanagan1, Logan J Brandt2, Andrew G Osborne1

  • 1Nuclear Science and Engineering, The Colorado School of Mines, Golden, CO 80401, USA.

Sensors (Basel, Switzerland)
|April 3, 2021
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Summary
This summary is machine-generated.

Mobile radiation detectors in cities can improve nuclear material detection. More sensors and slower speeds enhance detection, but source strength also plays a role in identifying threats.

Keywords:
distributed sensorradiation detection

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Area of Science:

  • Nuclear Security
  • Sensor Networks
  • Urban Monitoring

Background:

  • Ports of entry radiation detectors are crucial for national security against nuclear terrorism.
  • Mobile sensors offer a complementary strategy to detect nuclear materials missed by fixed systems.
  • Previous studies have not established the performance of mobile sensor networks on commercial vehicles.

Purpose of the Study:

  • To evaluate the performance and coverage of a mobile radiation sensor network in a large metropolitan area (New York City).
  • To determine the feasibility of using existing vehicle platforms like taxis and ride-sharing services for distributed nuclear material detection.
  • To analyze the impact of sensor network parameters and source characteristics on detection capabilities.

Main Methods:

  • Utilized radiation transport modeling and geographic information systems (GIS) for performance evaluation.
  • Integrated OpenStreetMap data to create a road grid and simulate vehicle paths.
  • Incorporated real-world data, including Uber pickup/drop-off records and NYSDOT data, to model vehicle movement.

Main Results:

  • The time required for the first detection of nuclear material increases with the velocity of the source.
  • Increasing the number of mobile detectors significantly decreases the time to first detection.
  • Detection time eventually plateaus, indicating a limit to network effectiveness that is dependent on the source's radiation strength.

Conclusions:

  • A mobile sensor network deployed on urban vehicles can enhance the detection of illicit nuclear materials.
  • Network performance is influenced by factors including sensor density, vehicle speed, and the strength of the radiation source.
  • This approach offers a viable supplementary layer to existing port-of-entry security measures for homeland defense.