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Actinism
Actinism is the property of solar radiation that leads to the production of photochemical and photobiological effects.〔Appendix 3. "Units for photochemical and photobiological quantities", pp.173-174 of ''The International System of Units (SI)'', BIPM, 2006 ()〕 ''Actinism'' is derived from the Greek ακτίς, ακτῖνος (a ray or beam). The word ''actinism'' is found, for example, in the terminology of imaging technology (esp. photography), medicine (concerning sunburn), and chemistry (concerning containers that protect from photo-degradation), and the concept of actinism is applied, for example, in chemical photography and X-ray imaging.
Actinic chemicals include silver salts used in photography and other light sensitive chemicals.
==In chemistry==
In chemical terms, actinism is the property of radiation that lets it be absorbed by a molecule and cause a photochemical reaction as a result. Einstein was the first to correctly theorize that each photon would be able to cause only one molecular reaction. This distinction separates photochemical reactions from exothermic reduction reactions triggered by radiation.
For general purposes, ''photochemistry'' is the commonly used vernacular rather than ''actinic'' or ''actino-chemistry'', which are again more commonly seen used for photography or imaging.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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