Model 3440 D-9
Daily Inspection
The gauge should be inspected daily before use to ensure
proper operation of all safety features as follows:
i 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 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
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 page D–10 for
instructions on cleaning the tungsten sliding block.
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.
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 A for
further instructions.
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