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4 Design and operation principle
4.1 BDG1 design
Constructed as a monoblock, BDG1 is enclosed in a shockproof container. Detector is based
on the scintillation block with photo amplifier. Scintillation block is based on the NaI monocrystal.
General BDG1 construction is given in the Figure 4.1.
Figure 4.1 – General BDG1 construction
Front panel bears:
1 – LED:
-
yellow – BDG1 testing mode indication;
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green – BDG1 calibration mode indication;
2 – Sound (audio) alarm – for sound alarms when set thresholds levels are exceeded;
3 – LED display "ALARM" (blue) – for light alarms when set thresholds levels are exceeded;
4
– Connector for PC or BDOI (RS485 or USB interfaces).
Geometrical (effective) center of the counter surface is marked with the “X” sign on the front
panel, on the back panel, as well as on the counter window covering, Figure 4.2.
1
3
4
2
