Sigma BM-286A Service Manual

3. OPERATING INSTRUCTIONS  page 20 

 

Model BM-286A 

 Efficiency: 

This parameter entry represents the efficiency of the detectors, in percent, to the 

source activity.  This value is used in calculating the activity. 

 

This value may be either entered manually or automatically calculated by the 

BM-286A.  Press on the white box and enter a value, or press "auto" to allow the 

unit to calculate the efficiency. 

 

1.  Manual entry method: 

Enter an efficiency in percent.  Entering a <0> will disable the current waste I.D. 

 

2.  Automatic calculation: 

The operator will be prompted for a count time (in seconds) and the calibration 

source activity (in nanocuries). 

 

Press "BEGIN" at which time a START button will appear. 

 

Press the "START" button and the unit will then take an nn second background. 

 

The operator will be prompted to place the source in the center of the chamber 

and press "START" to accumulate an nn second count with the source in the 

chamber. 

 

The efficiency will be displayed in the efficiency window.