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Chadwick's neutron detector, c 1932.

This detector was used by James Chadwick (1891-1974) in his discovery of the neutron. Inside the detector, particles from a radioactive source hit a beryllium target. From the resulting nuclear reactions neutrons were given off, detected when they dislodged protons from a piece of paraffin wax (see 1980-1048). Chadwick's discovery helped to rewrite existing beliefs concerning what was contained in the nucleus of an atom.

Image No. 10313943 | This is a Rights Managed image.

Inventory No.: 1974-0562
Source No.: 1974-0562

Credit © Science Museum / Science & Society Picture Library -- All rights reserved.
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