radiation vs sunbeam

radiation

noun
  • The process of radiating waves or particles. 

  • The transfer of energy via radiation. 

  • The shooting forth of anything from a point or surface, like diverging rays of light. 

  • A rapid diversification of an ancestral species into many new forms. 

  • Radioactive energy. 

sunbeam

noun
  • A visible, narrow, and intense (relative to ambient light) ray of sunlight. 

  • Any hummingbird of the genus Aglaeactis. 

  • Synonym of sunshine (“ironic form of address to an inferior or troublemaker”) 

  • Any of various lycaenid butterflies of the genus Curetis. 

How often have the words radiation and sunbeam occurred in a corpus of books? (source: Google Ngram Viewer )