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Standardization
Thermo Scientific
Radioactive Source Activity (mCi)
Isotope Half Life (years)
3. The Detector Data Counts Hold Mode dropdown allows the user to operate in
Live mode or Hold mode. In the Hold mode, the user may enter a value in the
Detector Data Counts Hold Value textbox. In Live mode, the user does not have
this option.
4. The user has the option of entering values into the following textboxes:
Total Background Counts
Detector under range limit (cps)
Detector over range limit (cps)
Total Raw Data Count (cps)
Total Filtered Data Count (cps)
Standardization is defined as a process to correct minor errors caused by material
buildup or wearing of the vessel walls. This process also ensures confidence in the
accuracy of the calibration curve. The process must represent a reproducible condition,
and therefore is generally performed either with vessel empty or not empty.
The standardization measurement provides the detector with a standard configuration
reference point. During the standardization cycle, the detector averages the detector
signal. The default cycle time lasts about two minutes. This averaged detector signal
provides a repeatable measurement of the signal produced in the standard
configuration.
Once the standardization measurement is completed, it can be repeated later to
compensate for any changes, such as increased attenuation due to process material
buildup on the vessel walls. The detector can then adjust the calibration values based
on the new standardization value. The calibration values are adjusted automatically
whenever a new standardization is performed. Thus, it is not necessary to repeat the
calibration measurements.
To access the information on the Application Standardization tab using only the
remote transmitter keypad, see
Figure
A-1.
Operation
Application Screens
LevelPRO User Manual
4-45
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