Detection of radioactive materials in an urban environment usually requires large, portal-monitor-style radiation
detectors. However, this may not be a practical solution in many transport scenarios. Alternatively, a distributed sensor
network (DSN) could complement portal-style detection of radiological materials through the implementation of arrays
of low cost, small heterogeneous sensors with the ability to detect the presence of radioactive materials in a moving
vehicle over a specific region. In this paper, we report on the use of a heterogeneous, wireless, distributed sensor
network for traffic monitoring in a field demonstration. Through wireless communications, the energy spectra from
different radiation detectors are combined to improve the detection confidence. In addition, the DSN exploits other
sensor technologies and algorithms to provide additional information about the vehicle, such as its speed, location, class
(e.g. car, truck), and license plate number. The sensors are in-situ and data is processed in real-time at each node.
Relevant information from each node is sent to a base station computer which is used to assess the movement of
radioactive materials.
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