Survival rates and logistic regression probability of 30-day mortality in BALB/c mice after TBI. Mice (n = 20 per group, 10 males and 10 females) received gamma-ray doses ranging from 6.0 to 6.4 Gy gamma-rays. Panel A: Kaplan-Meier survival curves show the proportion of mice surviving at each time point for each radiation dose. Panel B: Radiation dose-response relationship (DRR) using a probit model. Survival at day 30 was analyzed for each radiation dose and is shown as percentage mortality on the y-axis.