783620H / 1013 7. ANALYSIS REPORT
7.7.10. Summary of Nuclides in Sample
This table (Fig. 274) displays the final nuclide activity results with the clarifications below.
! The Nuclide abundance option must be enabled on the Report tab for this table to be displayed.
! If the library is not found or the spectrum is not calibrated, this table is suppressed.
Fig. 274.
! Nuclide Activity Notes:
— The “Time of Count” Activity column is weighted by the peak branching ratios as described in Section 6.10.2, and includes all corrections except for decay during collection and decay to collection time. Note that this includes Decay During
Acquisition, which is set on the Decay tab.
— The “Time Corrected Activity” column is weighted by the peak branching ratios as described in Section 6.10.3, and has all corrections applied including decay. It is only displayed in this table when Decay During Collection or Decay to Collection Time is enabled on the Decay tab.
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! Uncertainty Notes:
— Uncertainty Counting and Total Uncertainty data are reported in either percent or activity units as specified on the Report tab.
— The Total Uncertainty column is only displayed if the Total Uncertainty option is specified on the Report tab.
— If activity is set to zero, which may occur when using Directed Fit, the default percent uncertainty is 1000%.
— Uncertainty is omitted, or set to zero for some analysis engines, if the nuclide activity is reported with the “<“ flag (i.e. less than the calculated MDA value.)
! MDA Notes:
— Nuclides that have the “No MDA Calculation” flag set in the library will not calculate an MDA value. If an activity value is not calculated, these nuclides will be omitted from this table.
— When a nuclide is reported with the “<“ flag, the MDA values are displayed in the
Time of Count and Time Corrected Activity columns as applicable.
— For all analysis engines except for GAM32, if the b30winds.ini
parameter “Print
MDA flag” is set to “T” (true), the MDA value is reported in the far right column for nuclides that have an activity value calculated. If this parameter is set to “F” (false), nuclide MDA is not reported for nuclides that have an activity value calculated. The
GAM32 analysis engine does not report MDA values when nuclide activity is calculated regardless of this flag setting.
— The MDA Column header is determined by the b30winds.ini
parameter “Nuclide
Summary MDA Header,” which is set to “MDA” by default.
! Total Activity and Total Decayed Activity at the bottom of the table are the sum of the respective nuclide activity columns except that nuclides marked with the following flags are not included in the totals: *, &, <, B, F, (H for Decay Activity only).
! Some nuclide flags may not be reported if no nuclides in the list meet the specified criteria. Nuclide flags are defined as follows:
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783620H / 1013 7. ANALYSIS REPORT
# - All peaks for the activity calculation had bad shape. This does not invalidate the nuclide activity, but may indicate that the peaks may have interference, few counts
(as may also be accompanied with high uncertainty), tails due to detector performance, or other anomalies that may warrant investigation.
* - This nuclide activity was omitted from the total activity because the “Activity Not in Total” flag was set for this nuclide in the library.
& - This nuclide activity was omitted from the total activity because the “Activity Not in Total” flag was set for this nuclide in the library, and all of the peaks had bad shape. This flag is a combination of the # and * flag conditions.
< The nuclide MDA is reported in the Time of Count and Decay Corrected activity columns as applicable.
A - The nuclide activity is lower than the calculated MDA value. This condition does not necessarily mean that the nuclide activity is invalid or that the true activity must be below the detection limit. This condition may be due to a liberal peak acceptance criterion (i.e., Peak Cutoff), using Directed Fit in the analysis options for nuclides with no substantial peaks, or when nuclide activity is near the detection level depending on the MDA method specified on the System tab. Further investigation may be warranted for this condition.
B - This flag is a combination of the “A” and “F” flags. Activity is less than the calculated MDA, and the Key Line or Fraction limit test failed.
C The nuclide activity is lower than the Critical Level MDA method, which is based on the MDA Method 2 described in Section 6.9.2.2. This condition may be due to a liberal peak acceptance criteria (i.e., Peak Cutoff), or when using
Directed Fit in the analysis options for nuclides with no substantial peaks. Further investigation may be warranted for this condition.
F The Fraction Limit or Key Line test failed for this nuclide. Normally, nuclides that fail one of these tests would be reported as <MDA, but some conditions (i.e.,
Directed Fit or when using the WAN32 analysis engine) may result in nuclide activity being reported.
H - The number of half-lives specified in the b30winds.ini
file for the “Half lives decay cutoff” parameter has been exceeded for this nuclide. If this occurs, the
Time of Count Activity is reported as “>X Halflives” and the Time of Count
Activity is reported based on the analysis engine as follows:
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