ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Geiger-Muller tube measuring radiation from a source, with a scaler. The Geiger-Muller tube (at left) is instrument for detecting and measuring ionizing radiation (from the source at right). The Geiger-Muller tube contains a gas that discharges electrically when ionizing radiation passes through it.
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