ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY
Using a manganese bath. Physicist using an automated arm (top) to transfer a neutron source container (small sphere) into the smaller of the two manganese baths (large spheres). Neutrons are normally stable particles found in the centre of an atom. However, they are emitted by certain radioactive materials, such as the isotope californium-252 (Cf-252). The manganese bath measures neutron emission rate, the number of neutrons emitted per second by radioactive neutron sources. Photographed at the National Physical Laboratory, in Teddington, UK.
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