Table 1.

Type of IR	LQ (0 μM Na2S)	LQ (476 μM Na2S)	Pα	Pβ	SF10 (0 μM Na2S)	SF10 (476 μM Na2S)	DEF10
Photon	$SF=e^{-\left(0.042D+0.028D^2\right)}$ R2 = 0.9385	$SF=e^{-\left(-0.15D+0.084D^2\right)}$ R2 = 0.9645	<0.05	<0.05	8.30 Gy	6.21 Gy	1.34
Proton	$SF=e^{-\left(0.13D+0.030D^2\right)}$ R2 = 0.9734	$SF=e^{-\left(-0.11D+0.11D^2\right)}$ R2 = 0.9183	<0.05	<0.05	6.92 Gy	5.17 Gy	1.34

LQ is the equation for the surviving fraction obtained by fitting the survival data to the linear quadratic equation.

The α or β parameters for the LQ were compared for the IR survival curves with and without Na₂S using one-way ANOVA to obtain the p values for the α (P_α) or β (P_β) parameters, respectively.

SF₁₀ is the IR dose that reduced survival by 90%.

DEF₁₀ is the Dose Enhancement Factor at 10% survival and is calculated as follows.$DE{F}_{10}=\frac{S{F}_{10}0\mu MN{a}_{2}S}{S{F}_{10}476\mu MN{a}_{2}S}$