The BOX COUNTER system is designed to perform a fast gamma radiation monitoring of laundry, waste bags, tools and other small objects. The system measures the radioactive contamination of the items placed inside the measuring chamber, and compares the result with the release limits. System statuses such as alarm events and malfunctions are displayed on the PC of the control console and signaled by the visual/acoustic alarm unit installed on the top of the monitor.
The core of the system is the measuring chamber, which is designed to provide a large active volume (WxDxH 700x700x835 mm3) as well as a high sensitivity. Five detectors are installed, 4 in the doors and 1 in the top side.
The detectors are based on large plastic scintillators, properly dimensioned to achieve an excellent sensitivity throughout a wide gamma energy range. The external sides of the detectors are shielded with lead sheets, in order to minimize the environmental radiation background and improve the system sensitivity. Each detectors of the BOX COUNTER can detect a 4 kBq 137Cs source in 10 seconds (MDA, 95% confidence, for a point source at 50 cm).