Table 1.

Model parameters for two cell conditions in CHO-K1 cell line.

Model Parameters	Cell Condition
	Plateau Phase	Logarithmic Growth Phase
α1 = A1〈G1〉(=α0) (Gy−1)	0.155 ± 0.027	0.075 ± 0.025
β1 = B1〈G12〉 (=β0) (Gy−2)	0.048 ± 0.003	0.028 ± 0.008
$\left(a+c_1\right)\cong c_1\left(=c\right)\left({\mathrm{h}}^{-1}\right)$	0.704 ± 0.118	1.782 ± 0.441
Relative 〈G1〉 (=〈G〉)	1.000 ± 0.003	1.227 ± 0.009
Relative 〈G12〉 (=〈G2〉)	1.000 ± 0.007	1.457 ± 0.050
ρ (g · cm−3)	1.000 (water)	1.000 (water)
rd (μm)	0.500	0.500
$\gamma =y_D/(\mathrm{\rho }\mathrm{\pi }{r}_{\mathrm{d}}^{\mathrm{2}})(\mathrm{Gy})$	0.924 (250 kVp)	0.924 (250 kVp)
Each Phase	Cell Cycle distribution [%]
	Plateau Phase	Logarithmic Growth Phase
G0/G1	72.7 ± 6.6	37.6 ± 3.8
S	14.9 ± 2.3	52.4 ± 4.5
G2/M	12.4 ± 3.9	11.4 ± 0.7

The set of values for plateau phase was obtained from our previous report¹². In these parameters, a is a few percentage of c^17,20. Relative mean DNA amount per nucleus was normalized by that for plateau phase. The set of parameters for logarithmic growth phase was converted from that for plateau phase (SD was deduced by error propagation). In the parameters, (a + c) value for logarithmic phase was deduced from an experimental cell recovery data³³, and DNA amount represented by 〈G〉 and 〈G²〉 was obtained within the performed cell-cycle experiment. The set of physical parameters (γ, y_D, r_d, ρ) was taken from the previous reports¹².