. 2007 Apr 20;5(2):94–122. doi: 10.2203/dose-response.06-013.Scott

TABLE 4.

Lower-bound, central, and upper-bound estimates for the threshold, median lethal, and minimum alpha radiation dose for which the acute lethality risk R = 1, for exponentially decreasing dose-rate patterns to bone marrow.

Dose Category	T_1/2 = 0 (high-rate exposure only)	T_1/2 = 30 days	T_1/2 = 60 days
Threshold dose in Gy (lower, central, upper)^a	0.34, 0.51, 1.02	0.72, 1.08, 2.16	0.91, 1.37, 2.74
Median lethal dose in Gy (lower, central, upper)^a	1.0, 1.5, 3.0	1.59, 2.38, 4.76	1.91, 2.86, 5.72
Minimum dose in Gy for R = 1 (lower, central, upper)^a	1.37, 2.06, 4.12	2.14, 3.21, 6.42	2.51, 3.77, 7.54

^aLower-bound and upper-bound estimates are based on RBE_α = 3 and 1, respectively. Central estimates are based on RBE_α = 2.