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Table 1 Doses for 2.5 Gy nominal entrance dose measured with HS film and different collimators.

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