Model 3030 & 3030E Series Technical Manual Section 7
Ludlum Measurements, Inc. Page 24 November 2017
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 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. It turns on/off the background subtract and 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.
Show Parameters during power-up: When enabled, the following are
displayed to the LCD display during power up: firmware version, date, time,
high voltage, user-defined count time, and alarms.
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