NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Radiation measurements. Researcher using a parallel plate free-air ionisation chamber to determine X-ray intensities in roentgens (the unit used to measure radioactivity and the strength of radiation). Photographed in 1948, in the Physics Division of the National Physical Laboratory, Teddington, UK.
Model release not available. Property release not required.