Table 1 X-ray energy emission and absorption features for tungsten, iodine and water
From: DNA breaks induced by iodine-containing contrast medium in radiodiagnostics: a problem of tungsten?
Energy (keV) | Relative emission intensity of a typical 120-kV CT x-ray tube | Iodine mass energy absorption coefficient μen/ρ | Water mass energy absorption coefficient μen/ρ | μen/ρ (iodine) / μen/ρ (water) | Relative absorption (iodine in water) | Relative emission × absorption |
|---|---|---|---|---|---|---|
20 | 0 | 23.63 | 0.55 | 42.96 | 0.28 | 0 |
33 (I K edge) | 0.10 | 11.90 | 0.1557 | 76.429 | 0.49 | 0.049 |
40 | 0.18 | 9.62 | 0.06947 | 138.47 | 0.89 | 0.1602 |
50 | 0.21 | 6.57 | 0.04223 | 155.576 | 1 | 0.21 |
59.3 (W Kα edge) | 1 | 4.58 | 0.0328 | 139.634 | 0.91 | 0.91 |
60 | 0.21 | 4.52 | 0.0319 | 141.692 | 0.90 | 0.1911 |
67.23 (W Kβ edge) | 0.50 | 3.77 | 0.0285 | 132.28 | 0.85 | 0.425 |
80 | 0.17 | 2.33 | 0.02597 | 89.71 | 0.57 | 0.0969 |
120 | 0 | 0.91 | 0.0265 | 34.33 | 0.22 | 0 |