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86 ATOMLAB 500 DOSE CALIBRATOR
Moly Assay (Moly Breakthru)
(See Figures 5.2 - 5.8.)
The Moly Assay test measures the amount of Mo-99 in a syringe or vial of Tc-99m. To perform
this test, an empty Moly Shield is used to perform a background count. The syringe or vial of
Tc-99m is added to the Moly Shield. A count is then taken for the activity of the Moly counted
through the lead Moly Assay Shield. The vial or syringe is then removed from the lead shield
and placed into the dose calibrator. The system calculates the activity of Moly and the µCi of
Moly per mCi of Tc-99m.
If the Moly concentration is above the regulatory limit of 0.15 µCi of Mo-99 per mCi of Tc-99m,
the number is shown in red.
Figure 5.2. The Moly Assay Zero Background screen. Figure 5.3. The Moly Assay Zero Background reading.
To Perform A Moly Assay:
1. At the Home screen, touch <Nuclear Pharmacy>. The Nuclear Pharmacy screen is now displayed.
2. Touch <Moly Assay>. The Moly Assay Zero Background screen is displayed.
3. The Moly Assay Background screen allows the user to change the background counting time.
The screen displays the current background time. To change the background counting time,
select <Change Background Time>. A message will be displayed stating, “Changing
Background, Time Will Be Retained And Have A Global Effect Throughout The System.” Select
<Continue>.
NOTE: When you change the background counting time it changes the Moly Background
Time and the Dose Calibrator background counting time. If you do not want to change the
background time, select <Cancel> and go to Step 5.
4. The Set Count Background Time screen is displayed. Select the number after Background
Count Time. A pull-down menu is displayed with 30, 60 or 100 seconds. Select to highlight
the time that you desire and select <Enter>. The Moly Assay Background Counting screen will
be displayed with the new background counting time.
5. Make sure there is no source in the detector. Place the empty Moly Shield into the detector
and touch <Zero Background>.
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