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The counting activity, cA, is calculated as:
5. MENU COMMANDS
(20)
where:
Percent
= Gammas per 100 disintegrations (from library list)
Net Counts = Net counts in the peak
Live Time
= Live time in seconds
5.4.4. Input Count Rate
This command is supported by most newer ORTEC MCBs and disabled for unsupported units. It displays or hides the input count rate meter (Fig. 132) in the upper left corner of the spectrum window.
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(This is input count rate used for the dead-time calculation, not the number of processed pulses.)
This command is also on the right-mouse-button menu.
Fig. 132. Input Count Rate
Meter.
Detector windows show the current (live) input count rate, whether or not the MCB is currently acquiring data. Buffer windows show the input count rate when the spectrum was (1) transferred to the buffer from the MCB or (2) saved to disk.
5.4.5. Sum
The Sum function performs its calculation as follows, and displays the sum on the Marker
Information Line:
1) If the marker is not in an ROI, the counts in all data channels in the buffer (e.g., channel 1 to the maximum channel currently selected) are summed.
2) If the marker is in an ROI, the sum of the data channels in the ROI is shown on the display.
This is the same as the gross counts in the Peak Info display, but can be used on wider ROIs.
3) You can also sum a region by marking it with a rubber rectangle, then selecting Sum. This is illustrated in Fig. 133.
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Note that if the full spectrum view is positioned in the same corner, it can obscure the Input Count Rate box.
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