4-12 UTILITIES Biodex Medical Systems, Inc. © 2014
NOTE: The geometric efficiency for the system is independent of the isotope being used. The
geometric efficiency refers to the placement of the isotope in relation to the detector. If you
select probe, you would enter the outside diameter of the detector and the distance from the
probe. This uses a formula described in Appendix A under Isotope Efficiency Calculation. The
user must enter the unit of measure as cm. The factory preset for the outside diameter is
5.08cm, which is the 2-inch diameter detector. The distance from the probe is the distance from
the end of the distance bar to the face of the crystal. For the well it is the inside diameter,
which on the well shipped by Biodex, is 1.905cm. Factory set well depth is 2.54cm. This depth in
the well would be indicative of many wipes which is the center of the activity or where the wipe
would be located when lowered into the well. This would be the depth from the top of the crystal
(not from the top of the lead of the collimator) to the center of the activity of the wipe.
8. Enter the distance from the face of the probe detector (the crystal) to the end of the
collimator shield. Standard distance is 18.3 cm.
9. For the well, enter the depth in the well for the center of your wipe or sample. The default
value for the well is 2.54cm.
9. If you wish to perform in simulation mode rather than active mode, select <Simulated>. This
simulated detector can be deleted at any time.
NOTE: SIMULATION MODE
In simulation mode, the Atomlab 960 will provide mock measuring without the need for actual
activity. This allows the user to explore the various screens and modes of the system. The user
can select Custom, High, Medium, Low or Background for the count rate used for each reading.
10. Selecting the <Default> button will return values to the factory default values.
11. Once all fields have been completed, select <Accept>. The system returns to the Detectors
screen with the newly added detector and its associated information now displayed on the
list of detectors. You can now highlight to select the desired detector.
Edit A Detector:
1. From the Detectors screen, highlight the detector in the list to edit.
2. Select <Edit> to advance to the Detector Management screen. Information for the selected
detector is now displayed.
3. Highlight and then edit any field for which changes are necessary.
4. Select <Accept> to accept any edits made and return to the Detectors screen. The changes
made should be reflected in the appropriate fields. To return to the Detectors screen without
making changes, select <Back>.
Delete A Detector:
1. From the Detectors screen, highlight the detector to delete.
2. Select <Delete>. A message warning that you are permanently removing the detector that is
displayed. Ensure the detector noted is the one you actually wish to delete, then select
<Accept> to delete the detector, or <Cancel> to return to the Detectors screen without
making a deletion. If you have chosen to delete the detector, it will no longer appear when
you return to the Detectors screen.
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