Doc. # 5016
BM-185D/285D/286D
Rev. A
Operation and Service Manual
3.4.5 Efficiency Check
The Calculation Setup box will appear and the operator will be prompted for a count time (in
seconds) and the calibration source activity (in nanoCuries). Then 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.
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