3. Once the background count is completed, the Background and LLD screen displays the results. Click
on <OK> to accept the results and return to the Wipe Counting screen. If the results are not
acceptable, click on <Background> again and perform another background.
NOTE: <Estimate LLD> displays the same style results screen except it notes that the LLD is an estimate, not
measured. The estimate LLD counts for ten seconds each.
PERFORMING A WIPE TEST
1. From the Operation screen, click on <Wipe>. The Wipe Counting screen should now be displayed.
2. Click on <Select Wipe Areas> at the bottom of the screen. The Wipe Area Selection list should now
be displayed.
3. Double-click on the desired wipe area to select it and return to the Wipe Counting screen.
NOTE: If you have not yet performed a background count on this date, you must do so before proceeding with
the wipe test.
4. Click on the wipe location to be counted. If this wipe has been counted previously the system
displays the last count date and time.
5. Click on <Count Wipe> to perform the wipe test. The system now counts for only the isotope listed
in this area.
6. Once the wipe test is completed, the results of that wipe location are stored by date and time until
that particular wipe is recounted. The screen displays the results, in cpm, next to each isotope in the
isotope display window. The last isotope spectrum counted will be displayed at the top of the screen
with the ROI cpm shown to the right of the spectrum on the lower part of the screen. To the right of
the Isotope Results are listed the net activity, background, lower limit of detection, trigger level and
activities. These are shown in either cpm, bq, or microcuries.
To look at the net activity of any isotope, highlight the isotope desired in the Isotope Results window.
NOTE: The <Count Isotope> option is available for use only if an isotope has been highlighted in the Isotope Results
window.
If you click on <Count Isotope>, the system will count, for the time frame set under Preferences, only the
highlighted isotope. This allows the user to count for a longer period of time, ensuring better accuracy for
isotopes with high counts.
SPECTRUM ANALYSIS
To perform a detailed spectrum analysis, you must count an isotope using the <Count Isotope> icon for a
specific wipe. The rest of spectrum analysis functions the same way as described previously in this
manual.
1. INTRODUCTION
6-9 WIPE TEST
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