Table 2: The effective 1 x-ray mean photon energy with combinations of filter and applied voltage used in experiment 6.


Applied voltage

Filter 40 kV 60 kV 80 kV 100 kV
Effective mean x-ray photon energy, keV
0.5mm Al 20.64 24.49 29.09 33.21
1mm Al 22.84 27.44 32.82 37.30
2mm Al equivalent 2 24.79 30.53 36.81 41.55
1“Effective” means corrected for energy-dependent x-ray camera efficiency.
240 microns of copper (source-side) plus 0.5mm aluminium.