A. Appendix A
Isotope Efficiency Calculation
Your new Atomlab 960 features a 2" x 2" Tube Assembly configuration. The Operations Manual
provides examples of geometric efficiency in Appendix A are based on a tube assembly
diameter of 1.75". For the new 2" diameter Tube Assembly, the example values provided for
geometric efficiency should read as follows:
If the wipe or calibration source is placed 1/2" from the probe, the G.E. = 27.6%
For X = 0.25", G.E. = 37.9%,
For X = 0.75", G.E. = 20.0%
NOTE: The Atomlab 960 is shipped with the Isotope Efficiency screen set to centimeters (see
Figure 4.7 and Figure 4.12). The system can be set to centimeters, inches or any other unit of
measure, as long as it is consistent for the diameter and distance.
NOTE: The distance scale on the collimator is in centimeters. It is recommended that you work
in centimeters.
Please verify that the set-up in the Isotope Efficiency page is set to match the 2" (5.08 cm)
diameter tube supplied with this unit.
NOTE: 2" diameter = 5.08 centimeters
1.75" diameter = 4,445 centimeters
When the distance is changed in the Detector Management screen, the set-up associated with
the detector in the wipe or bioassay programs are automatically altered to match. It is vital that
you verify the correct geometric efficiency to ensure readings obtained in the wipe and bioassay
programs will be correct.
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