To Next Page

To Previous Page

XRF-2000 Series Operating Manual

4.5 Spectrum window

4.5.1 Qualitative Analysis

The objective of qualitative analysis is to identify the elemental component of

unknown substances. The first step in qualitative analysis is spectra acquisition.

Following spectra acquisition, the spectra must be manipulated and studied to

best determine additional spectra acquisition and/or the qualitative answer

desired. This covers guidelines for qualitative analysis including various spectral

manipulations.

 Setting acquisition parameters

(High Voltage and Tube Current setting in CAL File)

Since the purpose of qualitative analysis is to identify the components in a

sample, acquisition parameters should be selected to optimize the

identification CAL File. This is done by maximizing the spectral range

covered by the excitation-detection system as well as obtaining sufficient

sensitivity to identify even trace amounts of the elements present in sample.

This is accomplished by optimizing the X-Ray levels. Total CPS on Spectrum

window is a good indication of this optimized level. Voltage (KV) and current

(uA) settings, combined, should allow for Dead Time 30% in PIN Diode

System, 5% in Proportional Counter system.

 Guidelines to excitation parameter efficiencies

Place cursor on Main window and click the Main

window then press Alt+Ctrl+Shif simultaneously and

hold these keys and type “pioneer” and Press Enter

key. Then service menu will appear in spectrum

window. Click Service menu on the Spectrum

window.

On the service menu try to get a good spectrum

regarding application by changing all the parameters

such as HV, TC, Primary Filter and collimator etc.

Clicking adjusting TC to Dead time button will

optimize tube current for 30% of dead time(PIN

Diode) , 5%(Proportional Counter).

For more specific excitation conditions, the use of

filters to modify the exciting radiation is

recommended. Filters modify the exciting radiation

and may selectively enhance the excitation of certain

analytes within the sample.

MicroP XRF-2000 Series User Manual

Questions and Answers: