D–10
Cleaning the Tungsten Sliding Block
If the tungsten sliding block is not kept clean, it may stick
partially or completely open when the source rod is raised to
the SAFE (shielded) position.
This will result in high radiation levels near or in line with the
source rod opening on the bottom of the gauge. After cleaning
and reassembling the gauge as described below, check the
operation of the sliding block by pushing the source rod into the
backscatter position, then returning it to the SAFE position. You
should hear a click as the sliding block snaps shut.
Inspect the opening on the base of the gauge to confirm that the
sliding block is closed. If not, check that the sliding block spring
was properly installed after cleaning. If the sliding block still
does not close properly, immediately contact the nearest
Troxler Service Center. For a list of Troxler and authorized
Troxler service centers, refer to the front of this manual or visit
the Troxler website AT: www.troxlerlabs.com/services
The tungsten sliding block may require cleaning if the source
rod becomes difficult to lower into the “measure” position, or if
a click is not heard when the source rod is raised to the SAFE
(shielded) position. An improperly operating sliding block may
also result in erratic or incorrect density readings and increased
radiation levels.
WARNING!
Removal of the sliding block results in dose rates
of up to one rem per hour in the path of the beam.
Stand clear of the gauge bottom while performing
this procedure and proceed as quickly as possible
while working in the cavity to minimize exposure
to your extremities.
With the source rod in the SAFE (shielded) position, place
the gauge on its side.
Clean the heads of the four corner screws that hold the
bottom plate to the gauge base (see Figure 16). Using a
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