Cleaning the Tungsten Sliding Block
If the tungsten sliding blocks are not kept clean, they may stick
partially or completely open when the source rod is raised to the
SAFE (shielded) position. This may result in elevated 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 blocks 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 blocks are closed. If not, check that the sliding block springs
were properly installed after cleaning. If the sliding blocks still do
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 blocks 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. Improperly operating sliding blocks may also result in
erratic or incorrect density readings and increased radiation levels.
WARNING
Removal of the sliding blocks results in dose
rates of up to 30 mrem /hr. near the surface of
the source tip. 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.
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