Table 1. Effective doses of γ-rays and protons to decrease blood cell count by 10% (ED₁₀), 50% (ED₅₀), and 90% (ED₉₀).

Cell Type	Dose Rate	Time after Irradiation	Effective dose (and 95% CI) for γ-rays			Effective dose (and 95% CI) for protons
			ED10	ED50	ED90	ED10	ED50	ED90
WBCs	High	3 hours	0.41 (0.14 – 0.67)	1.87 (0.66 – 3.10)	4.21 (1.48 – 6.95)	0.32 (0.18 – 0.46)	2.10 (1.17 – 3.03)	6.96 (3.87 – 10.06)
	Low		0.91 (0.09 – 1.75)	6.05 (0.59 – 11.50)	20.09 (1.97 – 38.21)	NM	NM	NM
	High	48 hours	0.13 (0.09 – 0.17)	0.81 (0.55 – 1.08)	2.50 (1.70 – 3.30)	0.08 (0.06 – 0.11)	0.55 (0.37 – 0.72)	1.82 (1.24 – 2.39)
	Low		0.11 (0.07 – 0.15)	0.72 (0.47 – 0.96)	2.38 (1.57 – 3.19)	0.13 (0.09 – 0.18)	0.88 (0.59 – 1.18)	2.93 (1.94 – 3.91)
Neutrophils	High	48 hours	0.31 (0.11 – 0.52)	2.04 (0.71 – 3.37)	6.51 (2.25 – 10.76)	0.18 (0.08 – 0.28)	1.19 (0.55 – 1.84)	3.95 (1.81 – 6.10)
	Low		0.27 (0.09 – 0.45)	1.79 (0.61 – 2.98)	5.96 (2.01 – 9.90)	0.42 (0.05 – 0.79)	2.12 (0.26 – 3.98)	5.03 (0.61 – 9.45)
Lymphocytes	High	3 hours	0.05 (0.03 – 0.07)	0.33 (0.18 – 0.49)	1.11 (0.60 – 1.63)	0.05 (0.03 – 0.07)	0.32 (0.17 – 0.48)	1.07 (0.56 – 1.58)
	Low		0.06 (0.03 – 0.09)	0.41 (0.21 – 0.61)	1.36 (0.71 – 2.01)	0.06 (0.03 – 0.10)	0.41 (0.18 – 0.64)	1.35 (0.59 – 2.11)
	High	48 hours	0.05 (0.02 – 0.07)	0.33 (0.16 – 0.49)	1.08 (0.55 – 1.62)	0.08 (0.01 – 0.15)	0.41 (0.06 – 0.75)	0.98 (0.15 – 1.80)
	Low		0.06 (0.03 – 0.09)	0.40 (0.21 – 0.59)	1.33 (0.69 – 1.96)	0.11 (0.00 – 0.23)	0.54 (0.00 – 1.11)	1.25 (0.00 – 2.58)

High dose rate: 0.5 Gy/minute; low dose rate: 0.5 Gy/hour. Neutrophil counts at 3 hours post-irradiation were not decreased and not included in this table.