PerkinElmer QuantaSmart 1694267

CHAPTER 7
128 PerkinElmer Life and Analytical Sciences
Current IPA Chart
Select from the drop-down list an IPA parameter that you would like to view in
chart or tabular form.
The following IPA Charts are available:
Carbon-14 Background
This chart displays the results of the IPA test for Carbon-14 background counts.
This test checks for detector contamination or light leaks. The limit for this
parameter is > baseline + 4 standard deviations. The mean and SD for this
parameter are recalculated as new IPA data are generated.
Carbon-14 Background Baseline
This chart displays the Carbon-14 background data based on a fixed baseline
value. The number of values used to generate the baseline is defined in the IPA
Definition window. The default for this setting is five.
Carbon-14 Chi-Square
This chart displays the results of the IPA test that measures the reproducibility of
sample counting for Carbon-14. The test is performed by counting a single sample
in the detector 20 consecutive times with a count time of 30 seconds for each
repeat measurement. The normal range for this value is 7.63 to 36.19. with 95%
confidence. A properly performing instrument may generate Chi-Square values
outside this range 2% of the time, due to the statistical nature of the test. The
mean and standard deviation for this parameter are recalculated as new IPA data
are generated.
Carbon-14 Figure of Merit
Figure of Merit (FOM) is a measure of the sensitivity of the instrument for Carbon-
14 based on the Carbon-14 background and the instrument’s counting efficiency.
The mean and standard deviation for this parameter are recalculated as new IPA
data are generated.
Carbon-14 Efficiency
This chart displays the results of repeated Carbon-14 efficiency determinations.
The mean and standard deviation for this parameter are recalculated as new IPA
data are generated.
Carbon-14 Efficiency Baseline
This chart displays the Carbon-14 efficiency data based on a fixed baseline value.
The number of values used to generate the baseline is defined in the IPA
Definition window. The default for this setting is five.