Enhancing sensitivity of portal monitoring at varying transit speed.
The sensitivity of a portal monitoring system has been improved by introducing speed dependent integration time in the data processing of the count rate signal. Characterization and first tests have been performed using a pneumatically driven (137)Cs point source, before deploying the system to a test point at a railway junction near Vienna. At 14m/s the MDA could be reduced by a factor of two and at 28m/s by a factor of three compared to a fixed integration time of 1s, whereas high sensitivity at low speed remained unaffected.
Schroettner
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Radiation Safety and Application, Austrian Research Centers GmbH-ARC, Seibersdorf, Austria. thales.schroettner@arcs.ac.at
Kindl
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Presle
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