Radiation‐induced neural toxicity on C17.2 NSCs. Panel A, C17.2 NSCs received different doses of irradiation treatment, and the cell viability was analyzed by the MTS assay. The effect of irradiation on C17.2 NSCs shows a dose‐dependent decrease in cell viability. Panel B, Data from flow cytometric analysis shown that when cells were exposed to the lower dose of irradiation (≤6 Gy), apoptosis was the leading cause of cell death. As the dose of irradiation increased to 9 Gy, necrosis began to play a prominent role in cell viability. NSC, neural stem cell.