LUDLUM 3030, Руководство пользователя

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Model 3030 & 3030E Series Technical Manual
Section 7
Ludlum Measurements, Inc. Page 27 November 2017
Alpha QC Source Count Time (min):
This is the alpha source count time in
minutes used when the Override Count Time function is enabled.
Beta QC Source Count Time (min):
This is the beta source count time in
minutes used when the Override Count Time function is enabled.
Background QC Count Time (min):
This is the background count time in
minutes used when the Override Count Time function is enabled.
Alpha/Beta Upper & Lower Limits
: These determine what range is
acceptable for the background during a QC check. If the background does
not fall within these values, the QC check will fail.
Alpha/Beta Upper & Lower Limits
: These determine what range is
acceptable for the background during a QC check. If the background does
not fall within these values, the QC check will fail.
STEPS FOR PERFORMING A QC CHECK
1. To enable the QC mode, click on the box marked “Normal QC” in
the tab marked “QC Settings.”
2. Press the button marked “Reload Last Values” at the bottom of the
screen to see the last values calculated during the last HV
Plateau. The data shown include the “Last QC Performed,” the
“Last Alpha Efficiency,” the “Last Beta Efficiency,” the “Last
Alpha Background,” and the “Last Beta Background.” These
numbers are shown for reference ONLY. The QC check
predetermined limits must be chosen and input by the user.
3. Enter values for the “Standard Alpha Efficiency” and the “Standard
Beta Efficiency.” The values input here should reflect the
average efficiency with the given sources. After entering the
values, press the “Update” button.
4. Enter values for the “Allowable QC Efficiency.” These percentage
values entered allow the instrument to accept efficiencies that
are somewhat higher and lower than the standard efficiency.
For example, if the standard alpha efficiency is 25% and the
allowable QC efficiency is 5%, the acceptable alpha efficiency
will be from 20% to 30%. After entering the values, press the
“Update” button.
5. Enter the “Alpha Source Size” and “Beta Source Size” of the
sources to be used during the QC check. It is preferred to use
the DPM or µCi column wherever possible. Conversion from