Verfahren zur Erfassung einer bestimmten Roentgenstrahlungsdosis sowie zur Durchfuehrung eines solchen Verfahrens geeignete Stoffe

摘要

Increasing dosages of X-ray radiation progressively lower the color-play range of cholesteric-phase liquid-crystal materials. The effect is enhanced when an effective amount of an iodine-containing compound is used in the liquid-crystal material. Novel iodine-containing compounds are described, and articles are disclosed that give direct-reading indication of the dosages of X-ray radiation that they have received, without need for a separate development operation.