A radioactive contamination monitoring system with a bead-type radiophotoluminescence glass dosimeter

• An RPL glass sheet was constructed with a bead-type RPL dosimeter.
• An RPL monitoring scope system was constructed with a pulse-operated image intensifier and optical components.
• RPL from an X-ray irradiated glass sheet was detected with this system.
• The brightness of the RPL image exhibited acceptable linearity to the absorbed dose of the glass sheets.

A radiophotoluminescence (RPL) monitoring scope system was constructed to evaluate radioactive cesium contamination. RPL glass sheets were constructed by bonding RPL glass beads to a backing sheet. The RPL scope was constructed using an image intensifier and a CCD camera to detect RPL from the RPL glass sheet. A UV floodlight was also prepared as an excitation light source. The UV floodlight and an image intensifier were pulse-operated for high signal-to-noise RPL detection. In experiments, the RPL of X-ray irradiated glass sheets was measured with this present system. The RPL intensity, which is calculated from the brightness of obtained images, exhibits acceptable linearity to the absorbed dose. Another experiment showed that RPL can be detected at a distance of 10 m between the RPL glass sheets and the RPL detector.