Which materials can be identified with XRD? (There can be one or more correct answers)
Resins in the varnishes
Cellulose-based fibres in the textiles
Crystalline pigments in the paints
Amorphous pigments in the papers
Binders in the paints
Minerals in the clays
When comparing WD-XRF and ED-XRF, which statements are correct? (There can be one or more correct answers)
In WD-XRF, all the emitted fluorescence radiation reaches the detector at once; in ED-XRF, the detector detects all the fluorescent X-rays element by element
In ED-XRF, all the emitted fluorescence radiation reaches the detector at once; in WD-XRF, the detector detects all the fluorescent X-rays element by element
ED-XRF uses pulse-height discriminator to electronically classify the results; WD-XRF does not have an automatic classifier
WD-XRF uses pulse-height discriminator to electronically classify the results; ED-XRF does not have an automatic classifier
What are the main advantages of fused bead method over the pressed pellet method? (There can be one or more correct answers)
The particle size effects are eliminated
Mineralogy effects are eliminated
The method is relatively easy
Less material is needed for sample preparation
What are the advantages of WD-XRF? (There can be one or more correct answers)
Possibility to perform in-situ analyses
Fast elemental analysis
Cost-effective
No sample preparation
Computer-aided material identification
Elemental mapping possibility
Large database of known crystalline structures
Possibility to perform accurate quantitative analysis
Which of the following statements is true? (There can be one or more correct answers)
XRF can be used to determine the structure of crystalline materials
XRD can be used to determine elemental composition of the sample
XRD can be used to identify crystalline materials
XRF can be used to determine elemental composition of the sample
XRD and XRF can be used to identify liquid materials
XRD can be used to identify amorphous materials
XRD can be used for … (There can be one or more correct answers)
… measuring crystalline structure of the sample
… quantitative analysis and for that only 1 mg of sample is needed
… measuring diffraction angles and the intensities of diffraction peaks
… determining bond types in the samples
What are the disadvantages of WD-XRF? (There can be one or more correct answers)
Can’t detect lighter elements than aluminium
Impossible to analyse directly amorpheous materials
Can’t detect carbon in the sample
For the quantitative analysis, minimum of 1 g sample powder is needed
Which statements about the analysis of XRD patterns (diffractograms) are correct? (There can be one or more correct answers)
For the interpretation, library of known crystalline structures is used
It is possible to identify all the inorganic and organic materials
Analysis of XRD patterns is complicated and is typically done by a specialist
It is possible to determine if amorphous material is present in the mixture
Interpretation of XRD diffractogram is easier compared to the interpretation of WD-XRF spectrum
It is possible to determine which crystalline phases are in a mixture
Which of the following statements describe ED-XRF? (There can be one or more correct answers)
Easy to use
Ground samples needed for quantitative analysis
No sample preparation needed
A cross-section of the paint sample can be analysed
Enables direct analysis from the object surface
Non-destructive
