DAILY INSPECTION
The gauge should be inspected daily before use to ensure proper
operation of all safety features as follows:
✓
The source rod opening in the bottom of the gauge is equipped
with a spring-loaded tungsten sliding block that shuts when the
source rod is in the SAFE (shielded) position. To check the
operation of the sliding block, push the source rod down into the
backscatter position (see Figure 3–3 on page 3–5), and then
raise it back to the SAFE position. You should hear a click as
the sliding block snaps shut. Turn the gauge over and verify that
the sliding block is shut. If any portion of the opening is
uncovered, the sliding block should be cleaned before using,
transporting, or storing the gauge. Refer to page A–11 for
instructions on cleaning the sliding block.
NOTE
The bottom edge of the tungsten sliding block is beveled,
as shown in Figure A–3 on page A–12. As a result, there
may appear to be a slight opening when the sliding block
is closed. However, you should hear a click as the sliding
block snaps shut when the source rod is raised to the
SAFE position.
✓
If a radiation survey instrument is available, verify that the
radioactive gamma source is in place by measuring the exposure
rate at the surface of the gauge. The exposure rate should be
approximately 10–20 mrem per hour. A reading of about
1 mrem or less indicates either that the survey instrument is not
working properly or that the cesium-137 source may be missing.
Refer to the Troubleshooting section on page C–2 for further
instructions.
WARNING
Do not store or transport the gauge unless the
sliding block is closed. Increased radiation levels
may cause excessive personnel radiation exposure
and may violate transportation regulations.
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