MECHANICAL MAINTENANCE
SOURCES
The 3440-L gauge contains two radioactive sources. The americium-
241:beryllium source in the center of the gauge base is small and shielding
is not required. Never attempt to remove this source
. The Cs-137 source is
welded inside the tip of the source rod. In the SAFE or shielded position,
the Cs-137 source is surrounded by tungsten, reducing the radiation to safe
levels.
INSPECTING SOURCE ROD
To ensure the integrity of the source rod, Troxler recommends that a
qualified Troxler service person inspect the gauge and the source rod at
least every five years. This inspection includes checking for wear,
corrosion, or damage that could affect the safety of gauge operation.
CLEANING THE TUNGSTEN SLIDING BLOCK
If the 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 re-assembling the
gauge, check the operation of the sliding block by pushing the source rod
into the backscatter position and then raising it back to the shielded
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
completely closed. If not, check that the spring was properly reinstalled
after cleaning. If the sliding block still does not close completely, contact
your nearest Troxler Service Center immediately.
WARNING
Do not store or transport the gauge unless the sliding
block is completely closed. Increased radiation levels may
violate transportation regulations, and may cause
excessive personnel radiation exposure.
F–4
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