Fast Neutron Radiography

Ernst H. Jager; Franz. R. Thomanek

doi:10.1117/12.955207

14 September 1977 Fast Neutron Radiography

Ernst H. Jager, Franz. R. Thomanek

Proceedings Volume 0097, 12th Intl Congress on High Speed Photography; (1977) https://doi.org/10.1117/12.955207
Event: 12th International Congress on High Speed Photography, 1976, Toronto, Canada

Abstract

A sandwich arrangement of indium and calcium tungstate on both sides of an X-ray film, all inside a standard medical aluminium film cassette, was used in making ,shadowgraphs with fast neutrons. When exposed to a neutron flux, the indium plates will store a latent shadowgraph of an object, placed between the neutron source and the sandwich, through an (n,y)--reaction in the indium. The information conveyed by a fast neutron shadowgraph is partially complementary to that of an X-ray picture because fast neutrons are absorbed about equally by both light and heavy elements whereas X-rays are absorbed preferably by the heavy elements. With a sufficiently strong neutron flash source this technique should be applicable in recording fast events. Owing to the relatively long half-life of the activated indium, any other radiation accompanying the neutrons can be eliminated simply by inserting the X-ray film into the cassette only after the exposure of the indium sandwich. The optical density curve of this arrangement was recorded with a continuous source of 2.5-MeV neutrons. It shows that about 1012 neutrons/m2 should produce a useable image. However, this is a quite severe requirement for a flash source of fast neutrons.

Citation Download Citation

Ernst H. Jager and Franz. R. Thomanek "Fast Neutron Radiography", Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); https://doi.org/10.1117/12.955207

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