Neutron Radiography

Also found in: Dictionary, Thesaurus, Medical, Acronyms.

neutron radiography

[′nü‚trän ‚rād·ē′äg·rə·fē]
Radiography that uses a neutron beam generated by a nuclear reactor; the neutrons are detected by placing a conventional x-ray film next to a converter screen composed of potentially radioactive materials or prompt emission materials which convert the neutron radiation to other types of radiation more easily detected by the film.

Neutron Radiography


the production of an image of a specimen as a result of the action on a photosensitive layer of the secondary radiation that is generated when a specimen is irradiated by neutrons. Neutron radiography is used primarily in the investigation of metals, alloys, and minerals to ascertain the presence and distribution of various impurities in the specimen (seeFLAW DETECTION). The nuclei become radioactive as a result of neutron capture.

The neutron radiography method is based on the different probabilities of capture of a neutron by different atomic nuclei. If a neutron-irradiated specimen, usually a thin sheet, is placed against a photographic film, regions with different degrees of darkening are produced on the developed photograph; this procedure is called neutron photography. The darker areas correspond to nuclei that absorb neutrons more strongly. The presence and distribution of certain impurities in the specimen can be determined not only from the secondary radiation but also from the attenuation of the primary neutron flux as a result of neutron absorption by impurity nuclei. A foil made of an element that becomes beta active on exposure to neutrons, such as silver, dysprosium, or indium, is placed between the specimen and the photographic layer. In this case, the lighter areas correspond to stronger absorption of neutrons.


Radiografiia: Sb. statei. Moscow, 1952.


References in periodicals archive ?
The PNL neutron radiography platform is the first system capable of bringing neutron radiography out of an R&D environment and into a production setting, similar to industrial X-ray systems.
The book shows how neutron radiography is an efficient tool for materials research and NDT testing, especially with regard to microstructure, and to the analysis of natural material elements in situ.
Varian will market the LANSAR line from AccSys Technology for non-destructive testing applications, including neutron radiography, nuclear waste assay and on-line mineral analysis.
The Pegasus technology comprises advanced computer-based nuclear inspection and neutron radiography.