Calibration Screen Description
Multi-channel analyzer display: This display has a scale on the left side showing counts full scale. On the
bottom is the scale that shows the ROI.
ROI Counts: To the right of the MCA display is a box showing ROI counts for region of interest counts,
ROI cpm and time. The time is the time that the system is counting.
Isotope: The isotope in this box is the one displayed above as the region of interest. This is the isotope for
which the system will count.
Detector/Well: To the right of the Isotope is a box showing the active detector or well. To display the
available detectors or wells, place the cursor over the small arrow in this box. If you would like to change
the detector or well, click on the desired detector or well to select. The new detector will now be
displayed in the Detector box.
MCA Status: This box provides notes about what is happening at the current time. It will tell you when
counting is in progress or that information is being downloaded from the MCA box to the computer as
well as a number of other informational items.
Modes of Operation: Below the MCA Status box are tabs for the different modes of operation. These tabs
include Manual Mode, Thyroid Uptake, Wipe, Bioassay, Calibration and Chi-Square.
Mode or Function Specific Counting: Below MCA Status box is Mode or function-specific counting
information. Each mode has a <Start> button. Clicking on <Start> immediately begins the counting. The
<Abort> button is used to stop counting without storing the data. The <Stop> button stops the MCA
from counting but continues to use the information gathered in the program in which you are working.
High Voltage Adjustment should be performed the very first time the system is used, if the system is to
be used in a new environment or in the instance where a substantial change has been made, i.e., when
using a new tube.
NOTE: If a probe and well are both used the high voltage adjustment must be set independently for each detector.
The system must be ON and warmed-up prior to setting the high voltage.
High Voltage Adjustment
(See Figure 3-3 and 3-4.)
To Perform a High Voltage Adjustment
NOTE: When a High Voltage Adjustment is performed on a detector, the previous calibration and Chi-Square for
that detector are zeroed. You must perform a new calibration and Chi-Square for a detector following a High
Voltage Adjustment. You can do a High Voltage Adjustment for either detector at any time.
1. From the Operation screen, click on <Calibration>. The Calibration screen should now be displayed.
2. Click on <HVAdjustment> to access the High Voltage Adjustment counting screen.
3. Click on the appropriate detector.
4. Click on <Start> to perform the High Voltage.
NOTE: If you do not want to perform a High Voltage, click on the <Continue> and the system will return to
the Calibration page.
CONTENTS
3-5 ADMINISTRATION
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