Both counter tubes consist of a gas-filled counting chamber with
counting wires. The counter tubes incorporate the necessary
electronics such as amplifier and high voltage generator; there-
fore, the plug-in connection between the case (hood) and the
detector does not carry any high voltage, so there is no hazard
in touching it.
The respective operating voltage and the high voltage values
for plateau measurements are set to the optimum value for
each counter tube at the factory.
Operating point for 2 contamination probes
Detector LB 1231 LB 1233
(Xenon) (P10 Gas)
Beta HV 1850 V 1800 V
Alpha HV --------- 1100 V
A service adapter is required to check and change the high
voltage; this work must be carried out by experienced service
personnel.
7.3.1 LB 1233 with Alpha-Beta P10 Counter Tube
LB 6359 and Refill Station
This counter tube is designed as follows:
Electronic part as an attachment to the counting chamber, the
counting chamber with counting wires, the replaceable window
foil (metallized plastic on both sides, 0.3 mg/cm
2
) and the mesh
grid frame.
This detector can be connected to a local or central P10 gas
supply. The detector is automatically refilled and flushed when it
is placed into the wall holder.
Figure 7.6: Wall bracket for LB 1233
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