783620H / 1013
The value is:
6. ANALYSIS METHODS
(139)
where:
A
F i i
= the activity for the i th
isotope
= the i th
factor
l
= all the isotopes
The units of IEQ are the units specified in the report. If decay correction is specified, both the decay-corrected equivalent activity and the time-of-count equivalent activity are reported.
Isotopes that are not found (those whose MDAs are reported) are not included in the reported value. If the decay correction is more than 12 half-lives, the decay-corrected value is not included in the reported value.
NOTE
Be sure the isotope identifiers (e.g., “I-133") in the average energy table match the identifiers in the analysis library, otherwise, GammaVision will be unable to calculate this value correctly.
6.15. DAC or MPC
The DAC or MPC calculation is a measure of the fraction of the allowed activity or concentration in the current sample. The allowed activity or concentration values are stored in a table (see
Section 5.5.1.8). A value of 1 (or 100%) means the sample had 100% of the allowed value.
NOTE
Be sure the isotope identifiers (e.g., “Xe-133") in the table match the identifiers in the analysis library, otherwise, GammaVision will be unable to calculate this value correctly.
For cases where nuclides are identified in the analysis but not explicitly included in the DAC table, you can optionally add a nuclide named “Default” with an associated DAC value to the
DAC table for use in the calculation. If no “Default” entry is included, then nuclides with activity reported that do not match a nuclide name in the DAC table will not affect the DAC calculation.
The value is defined as:
(140)
309
