Model 3440 Appendix A–3
inspection of the source rod tip as follows to confirm its
integrity.
Extend the source rod just far enough to see the source rod tip.
The tip should appear flat to slightly rounded and smooth.
Complete the inspection as quickly as possible and stay at least
1 meter from the rod tip to minimize exposure (the dose rate at
1 meter from the unshielded source is about 2.7 mrem/hr).
If the visual inspection indicates that the source rod tip is
broken off (source is missing):
Immediately contact your Radiation Safety Officer (RSO).
Initiate a search for the source starting at the location where
the gauge was last used.
Report lost or missing radioactive sources to your state or
federal radiation control agency in accordance with
applicable regulatory requirements.
Contact the Troxler Radiation Safety Department for further
advice.
Gauge Readings Appear Erratic
Ensure that the source rod is properly positioned in the
desired measurement position. For backscatter readings, do
not allow the source rod to contact the material.
Erratic density readings may be caused by a dirty sliding
block. Clean the sliding block as instructed on page D-10 and
then take readings again.
Check the inside of the gauge for moisture. To dry the gauge
interior, remove the keypad. If necessary, use a hair dryer
(on low heat) to circulate warm air for 15 minutes to 1 hour.
Remove any foreign objects from inside the gauge.
Ensure the hardware mounting screws are tight and in
place.
Check count time – a four-minute count will give the highest
precision with a repeatability of r1 pcf.
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