High Definition X-Ray Fluorescence: Principles and Techniques

Table 2

Examples of nominal operating parameters for focusing, monochromatic X-ray beams integrated with microfocus X-ray sources.

Optic crystal X-ray line	Energy (keV)	Source power (W)	Bragg angle (𝜃𝐵)	Capture angle (sr)	Nominal focal spot size, FWHM (𝜇m)	Flux (cps)	Working distance (mm)
Ge 220
Cr Kα1	5.4	14	35.1	0.03	80	2×10^9	120
Si 111
Cu Kα1	8.0	14	14.2	0.015	50	1×10^9	150
Si 111
Cu Kα1	8.0	50	14.2	0.01	150	2×10^9	150
Si 220
Cu Kα1	8.0	14	22.8	0.01	50	3×10^8	135
Si 220
W Lα1	8.4	10	22.6	0.01	20	1×10^8	80
Si 220
Mo Kα1	17.5	14	10.6	0.01	60	1×10^8	120