Figure 3

(a) Cell death area's ratio, which is calculated by ratio of cell death area of PI (Propidium Iodide: dead) stained region to NTP plasma exposed area whose diameter is 1 cm, of lung cancer H460 cells and SEM images of lung cancer H460 cells for the control and Ar plasma treatment by 60 s, adhered at 2 mm, 4 mm and 6 mm depth positions of PBS, respectively; (b) Ion-induced secondary electron emission coefficient (γ) for lung cancer H 460 cell surfaces for the controls and plasma treated cells by 60 s, respectively, versus the incoming He ion energy ranged from 140 eV to 200 eV; (c) Molecular surface energy distribution of the lung cancer H460 cells for the control and Ar plasma treated.