#photochemistry

• Actinism — A rare historical or technical term used to describe the property or intensity of luminous radiation to produce chemical or structural changes in the materials it traverses or strikes. This phenomenon constitutes the historical basis of photochemical processes, being closely linked to actinism and the study of how solar or artificial light interacts directly with photographic emulsion or other substances sensitive to the ultraviolet spectrum.
• Actinic — Relating to radiation or luminous flux; capable of producing intense chemical (and photochemical) changes or reactions in the substances it strikes or traverses. Actinic properties are characteristic primarily of ultraviolet spectrum radiation and short-wave solar rays, being essential in the exposure process of conventional photographic emulsions or in triggering biological phenomena within living tissues.
• Actinogenic — Producing, generating, or emitting rays or radiation, particularly within the luminous, ultraviolet, or x-ray spectrum. In applied physics and chemistry, the term describes substances, devices, or phenomena capable of acting as structural sources of radiant energy, possessing the property to trigger photochemical reactions or molecular transformations in the surrounding environment via the emitted flux.
• Actinism — A structural and physiological property of luminous radiation, particularly short-wavelength radiation within the ultraviolet spectrum, to induce chemical reactions or molecular modifications in directly exposed photosensitive substances. This phenomenon constitutes the historical foundation of analog photographic technologies, light-triggered chemical synthesis processes, and complex biological reactions within living tissues.
• Actinogenic — Producing, generating, or emitting rays or radiation, particularly within the luminous, ultraviolet, or x-ray spectrum. In applied physics and chemistry, the term describes substances, devices, or phenomena capable of acting as structural sources of radiant energy, possessing the property to trigger photochemical reactions or molecular transformations in the surrounding environment via the emitted flux.
• Actinography — A historical medical and scientific term used in the past as a synonym for radiography or the technique of obtaining internal structural images of solid bodies using X-rays or other active radiant beams. In old applied physics, it also defined the general method of printing or recording onto a photosensitive film the chemical effects directly caused by exposure to an electromagnetic wave flux within the ultraviolet spectrum.
• Actinology — An interdisciplinary branch of science dealing with the structural and theoretical study of luminous and electromagnetic radiation (particularly within the ultraviolet and short-wave visible spectrum) and the chemical, photochemical, or biological effects they produce on exposed bodies. Actinology encompasses principles from optical physics, photochemistry, and biophysics to analyze how radiant fluxes interact with organic and inorganic matter.