Ludlum Measurements 251450, Manual, Page: 20 / 82

Model 3030P Technical Manual
Section 3
Ludlum Measurements, Inc. Page 12 February 2021
Specifications
Alpha Efficiency* (4π geometry)
:
35% for
239
Pu; 30% for
241
Am
Beta Efficiency* (4π geometry):
15% for
99
Tc; 23% for
137
Cs; 36% for
90
Sr/
90
Y
Channel Thresholds
: two upper and lower thresholds, which define the beta
and alpha regions. Each threshold may be set from 0 to 5000 mV. Default
settings are:
Beta Threshold = 75 mV
Beta Window = 700 mV
Alpha Threshold = 1000 mV
Alpha Window = 4000 mV
Status Indicators
: Backlit indicators for QC-daily QC check needed; LOW
BATT
MEANS
battery voltage is low;
CPM
/
DPM
means counting in CPM or
DPM mode; α
AL
/β
AL
means count has exceeded the alarm set point.
Section
3
When the Model 3030P is counting,
there will be colons present on the
display, as shown in the top right
photo.
The display also has a “rollover”
indication showing that the counts
have exceeded the display capability
(seen in the bottom right photo).
When this occurs, the display (alpha
or beta) that rolls over will display
decimal points between each digit.
It will also light both alpha and beta
alarm lights if they are not already
on. At the end of the count time,
the final result will show the net
reading, less 999999.