From: Use of an orthovoltage X-ray treatment unit as a radiation research system in a small-animal cancer model
Collimator
Diameter (cm)
Entrance dose (Gy)
Exit dose (Gy)
Entrance/Exit
C1
0.5
2.47 ± 0.17
2.01 ± 0.17
1.23
C2
1
2.45 ± 0.15
1.98 ± 0.15
1.24
C3
1.5
2.50 ± 0.14
2.07 ± 0.17
1.21