783620H / 1013 5. MENU COMMANDS
To save the ISO NORM MDA values, instead of the regular MDA values, to the germanium results file, mark the Report ISO NORM MDA On Reports checkbox.
NOTE
To enable this checkbox, you must first mark the ISO NORM checkbox on the
Report tab under Analyze/Settings/Sample Type....
Count, analyze with Analyze/Entire spectrum in memory..., and save the resulting spectrum. This will generate a Gamma Total analysis file results file
DETAIL.Seq
, in addition to the germanium
#_ddmmyy.Seq
file.
, and a germanium
To count only the background within the Integration Range when performing background
QA measurements (Section 8.2.2), mark the Use Range for Background QA checkbox in the bottom section of the dialog.
5.5.2. Peak Search
This command initiates a Mariscotti
27
-type peak search on the spectrum. The peak-search sensitivity is selected on the Systems tab of the Sample Type Settings dialog (see the discussion beginning on page 152). Each peak found is marked with an ROI. If the system is calibrated, the width of the ROI is three times the calculated FWHM of the peak. If not calibrated, the width of the ROI is based on the width of the peak as determined by the peak search. Overlapping or close peaks might have contiguous ROIs. Existing ROIs are not cleared.
The report function can be used with Peak Search to produce a semi-quantitative nuclide list for the spectrum.
5.5.3. ROI Report...
The ROI Report... function creates a report describing acquisition conditions and contents of all ROIs, and sends it to a disk file, the display, or the printer. The dialog shown in
Fig. 180 can direct the report output to a disk file (name chosen by user), a printer, or the PC display.
Fig. 180. Generate an ROI Report.
27
M.A. Mariscotti, “A Method for Automatic Identification of Peaks in the Presence of Background and its
Application to Spectrum Analysis,” Nuclear Instruments and Methods 50, 309
!320 (1967).
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®
v7 (A66-BW) 783620H / 1013
Only the ROIs in the expanded view are shown on the display. You can also select from two report formats, Paragraph and Column.
Examples of the Paragraph and Column format are illustrated in Figs. 181 and 182, respectively. The information supplied is the same in both formats.
If the spectrum is not calibrated, the following are reported for each ROI:
! ROI number
! Start channel of the ROI
! Stop channel of the ROI
! Gross area of the peak
! Net area of the peak, as calculated in Calculate/Peak Info
! Error in net area, as calculated in Calculate/Peak Info
! Centroid channel of peak, as calculated in Calculate/Peak Info
! FWHM
! FW(1/x)M
Detector # 1 ACQ 30-Sep-91 at 14:47:00 RT = 250057.0 LT = 250000.0
No detector description was entered
Background in shield with copper liner
ROI # 1 RANGE: 297 = 63.26keV to 323 = 67.86keV
AREA : Gross = 4231 Net = 490 +/-116
CENTROID: 309.50 = 65.47keV
SHAPE: FWHM = 0.96 FW(1/10)M = 2.11
No close library match.
ROI # 2 RANGE: 708 = 135.95keV to 736 = 140.91keV
AREA : Gross = 5898 Net = 482 +/-145
CENTROID: 724.08 = 138.80keV
SHAPE: FWHM = 0.66 FW(1/10)M = 1.40
ID: Hf181 at 136.28keV
Corrected Rate = 0.76 +/- 0.23 Bq
Detector # 1 ACQ 30-Sep-91 at 14:47:00 RT = 250057.0 LT = 250000.0
No detector description was entered
Background in shield with copper liner
Fig. 181. Example of Paragraph-Format Report.
If the spectrum is calibrated, both energy and channel values are given for 1–9 above, and in addition the following is included:
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