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32 ATOMLAB 500 DOSE CALIBRATOR
Isotope Response Time
The Atomlab 500 normally settles within three seconds as long as the minimum threshold level is
exceeded. When you first lower the source into the well, the activity value quickly jumps to the
final value. For a few seconds the value may fluctuate, but then the value settles down to a small
variation. As soon as the source is removed from the detector Well, the activity display will drop
down to a near zero value.
NOTE: Both the Detector Well Liner and Sample Holder should be periodically checked for
contamination as described in Appendix J under Records and Maintenance, Dipper and Well
Liner. (The more your dose calibrator is in use, the greater the frequency of contamination
checks required.)
Zero Background
(See Figure 3.6 and 3.7.)
Figure 3.6. The Zero Background screen.
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