Actinism

Actinism is the property of solar radiation that leads to the production of photochemical and photobiological effects. It is important in chemical photography and x-ray imaging, and causes sunburn and photodegradation of materials. Actinic chemicals include silver salts used in photography and other light-sensitive chemicals.

The word actinism is derived from the Ancient Greek ἀκτίς, ἀκτῖνος ("ray, beam").

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