biodex ATOMLAB 950 - Wipe Preferences

4. Double-Click on the desired wipe area to select the wipe, or highlight the wipe and click on <Select>.
The system returns to the Wipe Counting screen with the selected wipe now displayed in the Wipe
Area Name box.
NOTE: If you click <Close> on the Wipe Area Selection List, the system returns to the Wipe Counting screen
with the original wipe still selected.
7. Click on <Close> to return to the Wipe Counting screen. The edited wipe area should now
be displayed in the Area Name box.
Wipe Preferences
The Wipe Preferences screen allows the user to specify the detector, default count times for background,
wipe and isotope counting, and the geometric efficiency for the detectors. It also allows selection of the
report activity units (in dpm, becquerels or microcuries) that will be used for sealed sources or other
wipes.
1. From the Operation screen, click on <Wipe>. The Wipe Counting screen should now be displayed.
2. Click on <Preferences> at the bottom of the screen. The Wipe Preferences screen should now be
displayed.
3. Select the appropriate detector.
4. Enter default count times for background, wipe and isotope counting.
5. Select the desired report activity units, DPM, kBq or µCi.
6. If you have not already done so, set the Geometric Efficiency as explained in the Administration
section of this manual.
7. Once all parameters have been set, click on <Ok> to return to the Wipe Counting screen.
BACKGROUND
Before performing a wipe test, the system must perform a daily background count. The system requires
that you count background a minimum of one time per day. If the background changes dramatically in a
facility during the day, it is recommended to recount your background at the appropriate intervals.
NOTE: A 60-second background count is recommended. This means that each gain will be counted for 60 seconds.
1. From the Operation screen, click on <Wipe>. The Wipe Counting screen should now be displayed.
NOTE: If desired, you can at this point click on the <Estimate LLD> icon at the bottom of the screen. This will
provide a quick count and estimate of the Lower Limit of Detection (LLD) using the actual counting
parameters. By lengthening count times the system will have a better LLD.
2. Click on <Background> at the bottom of the Wipe Counting screen. The Background count will
begin automatically. The system will count the gains for all isotopes that have been turned on for
wipe testing. If multiple isotopes use the same gain, the system will only count the gain once, using
the appropriate regions of interest to calculate the dpms associated with this region for the selected
gain. As the system counts, a slidebar at the left of the screen shows the percentage completed. Wipe
locations are listed to the right of the slide bar with any results of previous wipes.
CONTENTS
6-7 WIPE TEST