✓
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 (Figure A–3). Using a 1/8-in. Allen
wrench, remove the four screws in the corner of the plate and
remove the plate. Do not remove the two screws located in the
center of the plate that secure the fixed block to the plate.
✓
To reduce radiological exposure, stand to one side of the gauge.
Paying close attention to the position of the sliding block,
remove the block.
✓
Using a stiff brush or rag soaked in alcohol, clean the sliding
block, the fixed block mounted on the bottom plate, and the
cavity.
✓
Re-install the sliding block with the angled side up. Apply a
light coating of Magnalube-G paste to the top angled surface of
the sliding block and to the top surface of the fixed block.
✓
Re-install the bottom plate. Do not over-tighten screws!
Ensure that the source rod moves up and down freely.
Figure A–3. Cleaning the Sliding and Fixed Blocks
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