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)
Tungsten Anode X-Ray Beam Qualities
Beam Code Added Filter (mm Al or Cu)

  HVL 1 (mm Al)

  HVL 1 (mm Cu) HC (Al) Air Kerma Rate (mGy/sec)
UW30-L 0.25 Al 0.228   60 2.308
UW40-L 0.48 Al 0.530   61 2.002
UW50-L 0.41 Al 0.789   61 2.845
UW80-L 1.16 Al 1.80   59 3.588
UW100-L 1.75 Al 2.81   59 3.910
UW20-M 0.15 Al 0.146   80 1.014
UW30-M 0.40 Al 0.351   65 1.319
UW40-M 0.79 Al 0.742   68 1.315
UW50-M 1.08 Al 1.04   66 2.020
UW60-M 1.50 Al 1.65   67 1.796
UW80-M 2.75 Al 3.00   68 1.821
UW100-M 4.77 Al 4.98   72 1.822
UW120-M 3.0 Al + 0.10 Cu 6.77   75 2.365
UW150-M 2.83 Al + 0.28 Cu 10.1
0.657 87 2.173
UW200-M 1.00 Al + 1.01 Cu 14.8
1.63 95 1.930
UW250-M 1.96 Al + 2.36 Cu 18.3
3.15 98 1.633
Molybdenum AnodeX-Ray Beam Qualities
UW Beam Code
1st HVL (mm Al) Added Filter (mm)  Air Kerma Rate (mGy/sec)
    Mo Rh  
UW23-MO 0.279 0.032    0.548
UW25-MO 0.303 0.032    0.708
UW28-MO 0.335 0.032    0.965
UW30-MO 0.356 0.032    1.21
UW35-MO 0.390 0.032    1.74
UW28-MR 0.407   0.03  0.659
UW32-MR 0.441   0.03  1.011