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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}N-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. 15 figs.
Inventors:
; ;
Issue Date:
OSTI Identifier:
392645
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; SCA: 420500; 070201; 070204; PA: EDB-96:166779; SN: 96001682402
Patent Number(s):
US 5,572,559/A/
Application Number:
PAN: 8-583,150; TRN: 96:028499
Contract Number:
W-31109-ENG-38
Resource Relation:
Other Information: PBD: 5 Nov 1996
Research Org:
Univ. of Chicago, IL (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; GAMMA RADIOGRAPHY; GAMMA SOURCES; DESIGN; OXYGEN 16 TARGET; NEUTRON REACTIONS; CHARGE-EXCHANGE REACTIONS; NITROGEN 16; NITROGEN 14; GAMMA DECAY; TRITIUM TARGET; HELIUM 4