DAILY INSPECTION
The gauge should be inspected daily before use to ensure proper
operation of all safety features as follows:
✓
Push the source rod down into the backscatter position, and then
raise it back to the SAFE (shielded) position. 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 position. Turn the gauge over and verify that the
sliding block is completely shut. If any portion of the opening is
uncovered, the sliding block should be cleaned before using,
transporting, or storing the gauge. Refer to the Mechanical
Maintenance section of Appendix C for instructions on cleaning
the tungsten sliding block.
✓
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 of Appendix C for further
instructions.
CAUTION
Do not store or transport the gauge unless the
sliding block is completely closed. Increased
radiation levels may violate transportation
regulations and cause excessive personnel radiation
exposure.
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