Definition

1. Noun:
   • Electromagnetic radiation capable of producing photochemical reactions: "Actinic ray" refers specifically to radiation in the electromagnetic spectrum that has sufficient energy to cause chemical changes upon absorption by substances. This property is central to processes like photography and photosynthesis.

Usage Examples

• Noun:
  • Sunlight contains actinic rays that are responsible for tanning and sunburn.
  • In the laboratory, they used a source of actinic rays to initiate the polymerization reaction.
  • The photographer understood that the film was sensitive to actinic rays from the blue end of the spectrum.

Advanced Usage

• Technical Context: The term is often used in scientific and technical fields (photochemistry, photography, medicine) to specify radiation with photochemical activity, primarily in the ultraviolet and short-wavelength visible regions.
  • The efficacy of the disinfectant lamp depends on the intensity of its actinic rays.

Variants and Related Words

• Actinic (adj): Of or relating to radiation capable of causing photochemical reactions.
  • The material showed signs of actinic degradation after prolonged exposure.
• Actinism (n): The property of radiant energy (especially solar radiation) that produces chemical changes.

Synonyms

• Photochemically active radiation
• Ultraviolet radiation (a common, specific type of actinic ray)

Related Phrases

• Actinic effect: The chemical effect produced by such radiation.
  • The study measured the actinic effect of different light sources on the compound.

Noun

1. electromagnetic radiation that can produce photochemical reactions