This clip comes from a recording of a real Geiger counter, the handheld instrument used to detect ionising radiation, rather than a synthesised effect. Its distinctive clicking has become familiar through documentaries, news reports and games set in nuclear or post-apocalyptic worlds, where rising click rates signal rising danger. Online, creators reuse the same authentic ticking for science explainers, survival gameplay and Chernobyl or Fallout-inspired edits, because listeners instantly recognise it without needing any explanation.