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Model 3030P Technical Manual
Section 7
Ludlum Measurements, Inc. Page 35 February 2021
3. The instrument counts background (no source inside the tray) and
receives results that are within the upper and lower limits specified.
QC Off/Normal QC/Background Update Only
: If enabled, 24 hours after the
last QC check the QC LED turns on and a QC check must be run before
the normal operation can resume. The “Normal QC” check takes a source
count and a background count. The “Background Update Only” takes only
background counts and replaces the current background subtract values with
the new values. In the Background Update Only mode the display shows the
counts in CPM with one decimal place.
Update Efficiency
: If enabled, the efficiencies calculated during the QC
check will replace the efficiencies used for the DPM calculation. This option
is only available in the Normal QC check mode.
Update Background Subtract
: If enabled, the background readings
received during the QC check will replace the current background subtract
values. This option is only available in the Normal and Background Only
QC check modes.
Override Count Time
: If enabled, the count times set by the count time
switch on the front of the instrument are overridden.
Last QC Performed
: the last date and time a successful QC check was
performed
Last Alpha/Beta Efficiency
: the last time a QC check was run, this was the
computed efficiency
Standard Alpha/Beta Efficiency
: These are the values that the QC check
will use to determine pass/fail. If the calculated efficiency is outside the
Standard Efficiency by the Allowable QC Efficiency %, the QC will fail.
Allowable QC Efficiency ± %
: This is the range for how close the computed
efficiency must be to the standard. A standard of 25% with an allowable
range of 5% specifies that to pass the QC check, the efficiency must be in
the range of 20% to 30% to pass.
Source Activity
: The DPM value of the source activity is saved to the
instrument and is used to determine the efficiency during a QC check.
Alpha QC Source Count Time (min):
the Alpha source count time in
minutes used when the Override Count Time function is enabled
Beta QC Source Count Time (min):
the Beta source count time in minutes
used when the Override Count Time function is enabled