PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY
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Radiation detector. Portable radiation detector, or Geiger counter, and identifier. The Geiger-Muller tube (Geiger counter) is an instrument used for detecting and measuring ionizing radiation. It contains a gas that discharges electrically when ionizing radiation passes through it. This device also identifies the type of radiation present.
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