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Updated: Dec 22, 2025

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Method for the diagnosis of aged plastic radiation portal monitors
S Ihantola1, P Holm1, H Jutila1
1STUK-Radiation and Nuclear Safety Authority, P.O. Box 14, FI-00881, Helsinki, Finland.
Abstract:
The light collection efficiency of plastic scintillator panels used in radiation portal monitors (RPM) declines over time. We present an efficiency calibration procedure to measure the capability of an aged panel to detect 186 keV gamma rays of highly enriched uranium (HEU). The method is based on a coincidence measurement of backscattered Cs-137 gamma rays having an energy of 184 keV. Energy calibration of the plastic panel can be obtained from the same measurement.
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