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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2010 Dec 22;79(5):1302–1309. doi: 10.1016/j.ijrobp.2010.10.052

Table 2.

Longitudinally Homogeneous Dose Response (Length Effect).

Study Species Location Source Length (mm) ED50
Bijl, et. al.(29) rat cervical 150–190 MeV protons 2 87.8 (80.4–96.4)*
4 53.7 (49.2–61.9)*
8 24.9 (21.6–28.6)*
20 20.4
Hopewell, et.al.(31) rat cervical-thoracic 250 kV xray 4 50.98(2.28)SE
8 30.11(1.45) SE
16 21.5(0.3) SE
van den Aardweg, et. al.(49) pig cervical 60Co 25 28.28(0.78) SE
50 27.68(0.57) SE
100 27.02(0.36) SE
*

95% confidence interval

SE = standard error.