BNC SAM 935 Portable Gamma Spectroscopy System - Manual (Page 15)

SAM 935™ Instruction Manual 11
2. Select Calibrate Area Monitor from the menu:
The 3 steps needed to perform a recalibration are listed in the order they should be done:
3.2.1 Automatic Coarse Calibration
This process requires only a Cs137 source. It may take up to several minutes depending on the activity of
the source.
1. Press the U TIL key.
2. Select Calibrate Area Monitor from the list.
3. Select Coarse Adj With Cs137 from the list, or just press F2.
4. If your SAM 935 was factory-calibrated, you will see the message below. Press Y ES (F3) the first
time you do a coarse calibration; this will cause the SAM 935 to start its hardware adjustment algo-
rithm from scratch. Answer N
O (F2) after the initial coarse adjustment (this will also make the cali-
bration process quicker).
5. Point the right front corner of the detector at the Cs137 standard (of approximately 0.5 to 2.0
µ
Ci)
and press S TART (F2) to begin data acquisition.
Before beginning the recalibration process, make sure the proper detector is selected using
the
Select/Edit Detector function under the U TIL key.
Answer Yes the first time you do a coarse calibration;
answer No thereafter.