7.2.2 Changing the Window Foil of Contamination
Probes with Scintillator
A damaged detector window foil can easily be replaced by the
user. BERTHOLD TECHNOLOGIES supplies a foil stretched over a
frame as spare part.
When replacing the foil, make sure that
the exchange takes place in a dry and dust-free place,
moisture or dirt cannot penetrate into the gap during the ex-
change!
the frame is replaced in semi-darkness, as the photomultipli-
er and the scintillator are sensitive to light. Do not work with
the device for 12 hours to allow the phosphorescence to de-
cay.
Proceed as follows
Change the foil in a darkened room (semi-darkness), as
the photomultiplier and the scintillator will be exposed
to light in the course of this process.
Turn device off and, if necessary, pull the power cord.
Place the device with the detector facing up onto a solid,
clean support.
Open the 4 Phillips screws holding the protective grid.
Take off the protective grid.
Remove the frame with foil.
Insert the new frame with the foil such that the sealing lip sits
perfectly to rule out any incidence of light.
Attach protective grid again and fix it with the 4 Phillips
screws.
Wait 12 hours before you start working with the device
to allow the phosphorescence radiation to decay.
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