NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Radon measurements. Researcher using an alpha-particle ionisation method to measure the radon content of breath samples. Radon is a radioactive gas found in nature, produced from radioactive ores in the ground. Levels are measured to assess whether they pose any risk to health. Photographed in 1948, in the Physics Division at the National Physical Laboratory, Teddington, UK.
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