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Title: Radiography apparatus using gamma rays emitted by water activated by fusion neutrons

Radiography apparatus includes an arrangement for circulating pure water continuously between a location adjacent a source of energetic neutrons, such as a tritium target irradiated by a deuteron beam, and a remote location where radiographic analysis is conducted. Oxygen in the pure water is activated via the .sup.16 O(n,p).sup.16 N reaction using .sup.14 -MeV neutrons produced at the neutron source via the .sup.3 H(d,n).sup.4 He reaction. Essentially monoenergetic gamma rays at 6.129 (predominantly) and 7.115 MeV are produced by the 7.13-second .sup.16 N decay for use in radiographic analysis. The gamma rays have substantial penetrating power and are useful in determining the thickness of materials and elemental compositions, particularly for metals and high-atomic number materials. The characteristic decay half life of 7.13 seconds of the activated oxygen is sufficient to permit gamma ray generation at a remote location where the activated water is transported, while not presenting a chemical or radioactivity hazard because the radioactivity falls to negligible levels after 1-2 minutes.
Inventors:
 [1];  [2];  [2]
  1. (Plainfield, IL)
  2. (Ibaraki, JP)
Issue Date:
OSTI Identifier:
870679
Assignee:
United States of America as represented by United States (Washington, DC) ANL
Patent Number(s):
US 5572559
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
radiography; apparatus; gamma; rays; emitted; water; activated; fusion; neutrons; arrangement; circulating; pure; continuously; location; adjacent; source; energetic; tritium; target; irradiated; deuteron; beam; remote; radiographic; analysis; conducted; oxygen; via; 16; reaction; 14; -mev; produced; neutron; essentially; monoenergetic; 129; predominantly; 115; mev; 13-second; decay; substantial; penetrating; power; useful; determining; thickness; materials; elemental; compositions; particularly; metals; high-atomic; characteristic; half; life; 13; sufficient; permit; ray; generation; transported; chemical; radioactivity; hazard; falls; negligible; levels; 1-2; minutes; neutrons produced; mev neutrons; gamma rays; gamma ray; neutron source; remote location; rays emitted; pure water; half life; radiography apparatus; elemental composition; fusion neutrons; energetic neutrons; energetic neutron; /376/378/

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