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. Author manuscript; available in PMC: 2010 Nov 10.
Published in final edited form as: Phys Med Biol. 2010 Apr 6;55(9):2481–2493. doi: 10.1088/0031-9155/55/9/004

Table 3.

WET values from the numerical method (WETNM), the BK rule (WETBK) and experiments (WETexp) for various materials with different thickness (tm) and proton beam energies (Ei). The difference between the results predicted by the BK rule and the numerical method (ΔRBK, NM), and the difference between the results predicted by the BK rule and the measured data (ΔRBK, exp) are also listed.

Ei tm WETNM WETBK WETexp ΔRBK, NM ΔRBK, exp
Material (MeV) (mm) (mm) (mm)(mm) (mm) (mm)
Lead 200 18.72 106.0 106.0 106.1   0.1 −0.1
200 13.27 75.3 75.4 75.9   0.1   0.5
200 5.45 31.0 31.1 30.8   0.1   0.3
100 5.45 29.8 29.7 29.3 −0.1   0.4
Aluminum 200 19.73 41.6 41.7 42.3   0.1 −0.6
200 14.90 31.4 31.5 32.2   0.1 −0.7
200 4.83 10.2 10.2 10.4   0.0 −0.2
100 14.90 31.1 31.1 31.5   0.0 −0.4
100 4.83 10.1 10.1 10.3   0.0 −0.2
PMMA 200 110.13 127.5 127.5 127.7   0.0 −0.2
200 99.96 115.7 115.7 115.9   0.0 −0.2
200 10.17 11.8 11.8 11.8   0.0   0.0
100 10.17 11.8 11.8 12.0   0.0 −0.2
Polystyrene 200 49.83 51.3 51.3 50.9   0.0   0.4
100 49.83 51.3 51.3 51.1   0.0   0.2
Lung substitute 200 40.09 11.7 11.7 11.8   0.0 −0.1
100 40.09 11.7 11.7 11.8   0.0 −0.1
Lead 172.2 0.03 0.17 0.17 0.32   0.0 −0.15
172.2 0.06 0.34 0.34 0.31   0.0   0.03
172.2 0.125 0.71 0.71 0.74   0.0   0.03
172.2 0.25 1.42 1.42 1.13   0.0   0.29
172.2 0.5 2.84 2.83 2.88 −0.01 −0.05
172.2 1.0 5.67 5.66 5.64 −0.01   0.02
Lexan 172.2 5.48 6.25 6.25 6.14   0.0   0.11
172.2 2.74 3.12 3.12 3.12   0.0   0.0
172.2 1.37 1.56 1.56 1.56   0.0   0.0