Energy Dispersive Measurement of X-Ray Tube Spectra

Abstract

A method for measuring spectral distributions of x-ray tubes directly with a solid-state detector is presented. Different anode materials (chromium, molybdenum, rhodium and tungsten) have been measured. Results for various applied voltages and take-off angles have been obtained.

Reference-free X-ray fluorescence analysis using well-known polychromatic synchrotron radiation

“…15 The following paragraph below will describe how the excitation spectrum can be accurately calculated when using the polychromatic SR from a bending magnet. For other different polychromatic X-ray sources, theoretical descriptions are usually employed to estimate the excitation spectrum, as any specific measurement of this spectrum 37 is only valid for a single experimental setting and may be subject to stability issues. Nevertheless, there are several approaches for calculating the excitation spectra of laboratory-based X-ray tube instruments.…”

X-ray tube spectra

“…Further investigations by Görgl et al 47,48 deal with measured responses and the influence of different tube voltages and target materials on the measured spectra. Finally, Aiginger et al 49 measured spectral responses from Cr, Mo, Rh and W tubes and compared their results with measured spectra from Gilfrich 50 and with computed spectra from Schossmann's approach. Figure 12 gives the results for a Cr tube (ϕ D 70°, ε D 20°, V D 45 kV).…”

“…Figure 12 gives the results for a Cr tube (ϕ D 70°, ε D 20°, V D 45 kV). An advantage of the measurement of spectra by the setup of Aiginger et al 49 is given in their conclusion: 'The spectrum of the Rh tube showed considerable spectral impurity, in some other cases there are minor lines present in the spectral distributions which are due to contaminations of the anode surface and the tube window and therefore cannot be found with a theoretical approach.' This conclusion can be supported by a statement given by Brown et al: 51 'The W OEG-50 tube used has been disassembled and found to have a 4800Å thick coating of W on the tube window.…”

X-ray fluorescence spectrometry

“…The authors' new model was based upon earlier work by this team at TU Vienna and the improvements made in the new model led to more accurate ®tting of the characteristic radiation. The provision of high quality experimental data for the testing of tube spectrum algorithms is of prime importance and was the subject of work reported by Aiginger and colleagues 168 at the Atominstitut in Vienna. A highly collimated Si (Li) detector was used to measure directly the energy spectrum of X-ray tubes with chromium, molybdenum, rhodium or tungsten anodes.…”