XRF-2000 Series Operating Manual
61
Remove sum peak: Sum, or pileup, peaks arise because two incoming x rays
arrive at the pulse processor (amplifier) within a time frame that is less than
the fast discriminator can detect the peak from the first event. This results in
peaks that have energies with the sum of the two incoming x-ray events. For
example, two incoming Fe-Kα photons (each with an energy of 6.4 keV),
which pileup, would produce a count at 12.8 keV. This can be removed by
enabling this selection.
RTD OFF: RTD (Rise Time Discriminator) circuit has been implemented in
the preamplifier. When RTD is active (RTD OFF is not checked), the shaped
pulses are internally gated and only pulses corresponding to “good” X-ray
events are allowed to be sent to the MCA for analysis. The RTD internal
threshold is set to about 2 KeV. If energies less than 2 KeV are to be
detected use RTD OFF function.
Repeat review and change calibration parameters to get good calibration curve.
Regression Condition window
In addition to graphic displays of the results, a detailed numeric report of the
analysis results is provided by the Cal Condition window. It includes the
regression coefficients and indices, the given and calculated concentration of
each standard, and the absolute and relative difference between the given and
calculated concentrations. In Report Line tab, the horizontal coordinate
represents the specified concentration of the standard as input in the Cal data
window; the vertical coordinate represents the calculated concentration as
calculated by the regression model.
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