783620H / 1013 5. MENU COMMANDS
5.4. Calculate
The Calculate menu (Fig. 127) provides useful analytical tools for spectrum manipulation. Smooth and Strip... are only available in buffer windows.
5.4.1. Settings...
This dialog (Fig. 128) allows you to set the “x” factor in the Peak
Info calculation of full width at 1/x maximum (FW[1/x]M) for the
ROI marked by the cursor (see Section 5.4.3). In addition, you can set the number of background channels used on each side of the peak. The background is subtracted before starting the calculation.
Enter the factor x, an integer from 2 to 99. This number will be retained and used until changed. (Peak Info always displays the FWHM, so an x of 2 is not useful.)
The number of Background Points ranges from 1 to 5, and the default value is 3.
5.4.2. List Data Range...
Use this dialog (Fig. 129) to retrieve a specified time slice of data from a List
Mode (
.LIS
) file that has been recalled into a buffer window. GammaVision samples the list mode data stream every
250 milliseconds of real time, and can display the data with a granularity of
1 second (see the List Mode discussion in Section 1.6).
Fig. 128.
Fig. 127. Calculate
Menu.
Click to highlight the desired start and end Date/Time values, then adjust them
Fig. 129. Select a Time Slice of List Mode Data.
by clicking the up/down buttons; or set the desired Data Start Date/Time and enter the time slice Duration in whole seconds.
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To retrieve the data, click Apply. Click Increment to add the next more data to the currently displayed time slice; set the Duration, then click Increment. To save a time slice in any Gamma-
Vision file format (i.e., as list files and/or spectrum files), use the Save commands.
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The analogous JOB stream command, SET_RANGE (page 414), can use fractional real times and durations.
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