Ludlum Measurements 2200 - Section 6: Calibration Procedures

Model 2200 Scaler Ratemeter
Ludlum Measurements, Inc. Page 12 March 2016
Window Operation and Energy
Calibration Procedures
General
The Model 2200 is calibrated at the factory so that one turn on the
THRESHOLD controls is equal to one turn on the window dial.
Equipment Required
 Detectors capable of energy discrimination. Examples used are the
Ludlum Models 44-3 and 44-2.
 Known gamma radiation sources. Typical sources are
137
Cs (662 keV)
and
241
Am (60 keV).
Procedures to Calibrate
Threshold to 10 keV/Turn
Initial Model 2200 control settings
 Window ON-OFF switch at OFF
 Ratemeter RANGE selector switch at X10
 THRESHOLD dial at 5.50
 WINDOW dial at 1.00
 HV dial at 0.00
Turn-on
 Connect the Model 44-3 detector to the instrument.
 Turn the power switch to the appropriate power supply.
Operation and Calibration
 Expose
241
Am to the detector.
 Increase the HV setting until the count from the source just starts to
count.
Sectio
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