1 automatic coarse calibration, Automatic coarse calibration – BNC SAM 935 Portable Gamma Spectroscopy System User Manual

Page 15

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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.

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