Energy-Dispersive XRF Excitation and Filter Guide Principle of X-ray fluorescence 1. An incoming X-ray knocks out an electron from one of the orbitals surrounding the nucleus. 2. A hole is produced in the orbital leaving an unstable, high-energy atom. 3. To regain equilibrium, an electron from an outer orbital fills the hole. The excess energy is emitted as a fluorescent X-ray. Different components of the EDXRF spectrometer Detection principle of the silicon drift detector (SDD) EDXRF detection of hazardous elements in NIST SRM 2710 Montana soil PO41175-EN 0719 Find out more at thermofisher.com/XRF 47 22.104 24.987 25.517 2.984 3.151 3.528 K L Symbol ELEMENT NAME 107.87 ATOMIC NUMBER Kα wtd. avg. (keV) Kβ wtd. avg. (keV) K abs. edge (keV) OPTIMIZED FILTER ALTERNATE FILTER ATOMIC WEIGHT Lα 1 (keV) Lβ 1 (keV) LII abs. edge (keV) Color Condition Filter Default Optimized Code Number Name kV Atmosphere Low Za Low Za II Low Zb Low Zc Mid Za Mid Zb Mid Zc High Za High Zb Vacuum (solids) / He (liquids) Vacuum (solids) / He (liquids) Vacuum (solids) / He (liquids) Air Air Air Air Air Air 4 8 8 12 16 20 28 40 50 0 1 2 3 4 5 6 7 8 FILTER WHEEL CAMERA SDD DETECTOR BERYLLIUM WINDOW X-RAY TUBE BERYLLIUM WINDOW X-RAY TUBE COLLIMATOR