CLEANING THE TUNGSTEN BLOCKS
If the tungsten sliding block and the fixed tungsten block are not
kept clean, the sliding block 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.
The tungsten sliding block and the fixed tungsten 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
Do not store or transport the gauge unless the
sliding block is closed. Increased radiation levels
may violate transportation regulations, and may
cause excessive personnel radiation exposure.
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.
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