To Delete an Isotope
Only custom isotopes can be deleted from the Isotope Editing screen. Factory set isotopes cannot be
deleted.
1. Click on the <Isotope> icon in the primary tool bar. The Isotope Editing screen should now be
displayed.
2 Click on <Open> The Isotope List should now be displayed.
3. Highlight the isotope to delete.
4. Click on <Delete>. The system will ask if you really want to delete the selected isotope. Click <Yes>
to delete or <No> to abort. The system will now return to the Isotope Editing screen. If you have
deleted a custom isotope it will no longer show on the Isotope list.
Isotope Report
Isotope Reports can be generated showing all the parameters for individual isotopes or listing all the
isotopes. These printouts can be accessed by selecting the <Report> icon in the primary tool bar.
Isotope Efficiencies
(See Figures 3-10 and 3-11.)
All efficiencies are set to zero as shipped from the factory. The user has the choice of either calculating the
efficiencies to be used or using the analytically determined factory defaults.
NOTE: The total efficiency for an isotope using the system is the Geometric efficiency times the detector efficiency .
See Apendix A for more details.
NOTE: An isotope will not be available for use for Wipe Testing or Bioassay unless an efficiency has been set to
other than zero.
Setting Geometric Efficiency
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.
1. From any screen, click on the <Isotope> icon in the primary tool bar. The Isotope Editing screen
should now be displayed.
2. Click on <Efficiency> in the screen tool bar. The Detector Efficiency screen should now be displayed.
3. Click on <Set> in the Geometric Efficiency box and then select either well or probe. You can now
enter information concerning the selected detector.
NOTE: 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. You must enter the
same unit of measure for both of these numbers. It is suggested to use centimeters for these as there is a cm
scale for distance from the face of the detector on the collimator. 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
where 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.
4. Once you have set the desired numbers, click <OK> to return to the Detector Efficiency screen. If a
different efficiency than the one you desire is displayed on the Detector Efficiency window, double
click on the box next to the appropriate detector and type in the efficiency you desire.
CONTENTS
ADMINISTRATION 3-16
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