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Cleaning CERN detector, 1969. Researcher cleaning the 1.2-metre bubble chamber at CERN, the European particle physics laboratory, Switzerland. At CERN, accelerators are used to form beams of high-energy particles and collide them with targets. The collisions create new particles that are detected by devices such as bubble chambers. These use an unstable liquid that boils into bubbles as the particles pass through. The liquid is usually cold, compressed hydrogen or helium, but this one contained heavier liquids. Particle track images help reveal the fundamental structure of matter. CERN was founded in 1954. Bubble chambers are no longer used in modern particle physics research.
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