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北京眾星聯恒科技有限公司
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536
LiF(200)， LiF(220)， LiF(420)
LiF crystal types exist in a variety of lattice planes (200， 220， 420， etc.). In the sequence (200) --> (220) --
> (420)， resolution increases and reflectivity decreases (Fig. 17).
Fig. 17: Intensities of the crystals LiF(220) and LiF(420) in relation to LiF(200). (Intensity LiF(200) =
1)
LiF(200):
A universally usable crystal for the element range atomic number 19 (K) onwards; high reflectivity， high
sensitivity.
LiF(220):
Lower reflectivity than LiF(200) but higher resolution; can be used for the element range atomic number
23 (V) onwards; particularly suitable for better peak separation where peaks overlap.
Examples of the application of the LiF(220) for reducing peak overlaps:
Cr Ka1，2 - V Kb1
Mn Ka1，2 - Cr Kb1
U La1 - Rb Ka1，2
LiF(420):
One of the special crystals; can be used for the element range atomic number 28 (Ni or Co Kb1) onwards;
best resolution but low reflectivity.
Figure 17 shows a reflectivity of only 10% of that of LiF(200) for LiF(420) in the energy range around 10
keV.
PET:
A universal crystal for the elements Al to Ti (K-peaks)， Kr to Xe (L-peaks) and Hf to Bi (M-peaks).
ATTENTION
The PET is the crystal with the greatest heat-expansion coefficients， i.e. temperature fluctuations are
most noticeable here.
Fundamental Principles Introduction to X-Ray Fluorescence (XRF)
