Energy-Dispersive XRFExcitation 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

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K L

SymbolELEMENT NAME

107.87

ATOMIC NUMBER

Kα wtd. avg. (keV)Kβ wtd. avg. (keV)K abs. edge (keV)

OPTIMIZED FILTER

ALTERNATE FILTER

ATOMIC WEIGHTLα1 (keV)Lβ1 (keV)LII abs. edge (keV)

Color Condition Filter Default OptimizedCode NumberName 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