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Table 5 Measured cutout factors for 7 MeV electron beam. Measured cutout factors for 7 MeV electron beam (reference: measured output for 9 MeV beam of 10 × 10 cm2 cone; A/P: area to perimeter)

From: Design and evaluation of electron beam energy degraders for breast boost irradiation

 

A/P ratio

Energy

Cone size (cm2)

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

3.00

3.75

7 MeV

10 × 10

0.335

0.490

0.623

0.738

0.805

0.858

0.870

0.882

-

-

15 × 15

-

-

-

-

-

0.900

0.922

0.946

0.963

0.972

9 MeV

10 × 10

0.903

0.952

0.983

1.000

1.005

1.008

1.004

1.000

-

-

15 × 15

-

-

-

-

-

1.003

1.005

1.007

1.004

0.996