AAPM Accredited NIST-Traceable Beam Qualities
Therapy Ion Chamber | Diagnostic X-Ray Ion Chamber |
60Co (in water per TG-51 or air kerma per TG-21) | Choose from the Tungsten (radiographic) anode beams or the Molybdenum (mammographic) anode beams listed below |
137Cs | |
X-Ray (choose from the Tungsten anode beams listed below) |
The numeric value in the beam code corresponds to the kVcp of the x-ray unit. The letters L and M in the beam code indicate Light and Moderate filtration, respectively. HVL1 is the first Half-Value Layer and HC is the Homogeneity Coefficient (Ratio of HVL1/HVL2 times 100). Inherent filtration for the UW Tungsten Anode X-ray unit is 3.0 mm of beryllium. Please note that interpolation of calibrations between the L and M beams is not recommended.
Tungsten Anode X-Ray Beam Qualities | ||||
Beam Code | Added Filter (mm Al or Cu) | HVL 1 (mm Al) | HVL 1 (mm Cu) | HC (Al) |
UW30-L | 0.24 Al | 0.24 | 61 | |
UW40-L | 0.46 Al | 0.51 | 59 | |
UW50-L | 0.63 Al | 0.80 | 61 | |
UW80-L | 1.20 Al | 1.82 | 60 | |
UW100-L | 1.80 Al | 2.81 | 59 | |
UW20-M | 0.19 Al | 0.15 | 79 | |
UW30-M | 0.41 Al | 0.36 | 66 | |
UW40-M | 0.77 Al | 0.75 | 68 | |
UW50-M | 0.92 Al | 1.03 | 66 | |
UW60-M | 1.66 Al | 1.68 | 68 | |
UW80-M | 3.09 Al | 3.07 | 68 | |
UW100-M | 5.21 Al | 5.10 | 73 | |
UW120-M | 2.21 Al + 0.13 Cu | 6.78 | 76 | |
UW150-M | 2.49 Al + 0.31 Cu | 10.30 | 0.66 | 86 |
UW200-M | 0.89 Al + 1.06 Cu | 14.73 | 1.62 | 94 |
UW250-M | 4.29 Al + 2.86 Cu | 18.49 | 3.13 | 98 |
The numeric value in the beam code corresponds to the kVcp of the x-ray unit. The character suffix “MO” refers to molybdenum anode/molybdenum filter combination, and the suffix “MR” refers to a molybdenum anode/rhodium filter combination. Inherent filtration for the UW Molybdenum Anode X-ray unit is 1.0 mm of beryllium. Please note that interpolation of calibrations between the Molybdenum anode beams and the Tungsten anode beams is not recommended.
Molybdenum AnodeX-Ray Beam Qualities | |||
UW Beam Code | 1st HVL (mm Al) | Added Filter (mm) | |
Mo | Rh | ||
UW23-MO | 0.280 | 0.032 | |
UW25-MO | 0.305 | 0.032 | |
UW28-MO | 0.336 | 0.032 | |
UW30-MO | 0.359 | 0.032 | |
UW35-MO | 0.390 | 0.032 | |
UW28-MR | 0.424 | 0.03 | |
UW32-MR | 0.453 | 0.03 | |
