
Model 3030P
Technical Manual
Section 7
Ludlum Measurements, Inc.
Page 33
February 2021
In DPM mode, the counts are adjusted for count time and efficiency. For
example:
Count Time = 0.1 minutes (6 seconds)
Efficiency = 25%
Input = 1000 DPM
CPM = 250 counts per minute (no background subtract or crosstalk
calculations)
DPM = 400 disintegrations per minute (no background subtract or
crosstalk calculations)
Alpha/Beta Efficiency
: These values are only available when the unit is in
DPM count mode. This is used to calculate the DPM reading and is
expressed as a percent. The QC mode has a function to update the
efficiency with values calculated from the QC check.
Activate Background Subtract
: This is only available when count mode is
CPM or DPM. This turns on/off the background subtract. It will subtract
the background from each channel and display the net count.
Alpha/Beta Background Subtract
: These values will be subtracted while the
instrument is counting. For example, in CPM mode, with an input of 2000
CPM and a background subtract value of 1000, the reading will display
“1000.” The QC mode has a function to update the background subtract
with values calculated from the QC check.
Activate Crosstalk Correction
: This is only available when count mode is
CPM or DPM. This control turns on/off the crosstalk correction.
% Alpha to Beta Crosstalk
: This is the percent of alpha counts that are seen
by the beta channel. Setting this number to 2% subtracts 2% of the received
alpha counts from the beta channel.
% Beta to Alpha crosstalk
: This is the percent of beta counts that are seen
by the alpha channel. Setting this number to 2% subtracts 2% of the
received beta counts from the alpha channel.
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