English: A photograph of one of the surface detectors of the Telescope Array in Delta, Utah with illustrations demonstrating how the equipment is activated when particles from a cosmic ray air shower pass through a sheet containing organic scintillators. These scintillators emit a photon when a particle passes by them. These photons are gathered and recorded by photomultiplier tubes. A similar illustration by the same author can be found in the Millard County Cosmic Ray Center in Delta, Utah.