BGO crystal of L-3 detector, CERN

BGO crystal of L-3 detector, CERN

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Caption: A scientist at CERN's L-3 experiment checking the dimensions of a crystal of Bismuth Germanium Oxide (BGO). BGO (formula Bi4 Ge3 O12) is used to detect electrons and photons generated by electron- positron collisions in the LEP collider ring. When an electron or photon enters the crystal, its energy is converted into light. The light is channelled by the crystal to photodiodes producing an electronic signal. 11, 000 crystals, totalling 12, 000 kg in weight, are used in the detector, measuring the energy and position of the incoming particles at very high resolution. The LEP and L- 3 detector were innaugurated on 13 November 1989.

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Keywords: bgo, bgo crystal, bismuth germanium oxide, cern, checking, detector, electron detector, electron/positron collid, european centre for, l-3 experiment, lep, measurement of, nuclear research, particle physics laboratory, photon detector, physicist, quality check, scientist

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