Chapter 4 Operational Verification Tests
GM Tube Failure Indication
If the unit’s Geiger-Mueller tube should stop
counting, the display will flash, showing three
rows of three dashed lines each (Figure 5).
Figure 5 The GM Tube Has Failed
Contact your local Mirion Technologies
(Canberra) Service Center for repairs.
Operation at Low Temperatures
At temperatures below –22 °F (–30 °C), it
takes somewhat longer for characters to form
on the display. The UltraRadiac-Plus
automatically corrects for this by sensing the
ambient temperature and increasing the
display refresh time from two to five seconds.
Operation of the UltraRadiac-Plus is
otherwise unchanged.
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