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

Abstract

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:
Research Org.:
Univ. of Chicago, IL (United States)
OSTI Identifier:
392645
Patent Number(s):
5,572,559
Application Number:
PAN: 8-583,150; TRN: 96:028499
Assignee:
Dept. of Energy, Washington, DC (United States)
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 5 Nov 1996
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

Citation Formats

Smith, D L, Ikeda, Yujiro, and Uno, Yoshitomo. Radiography apparatus using gamma rays emitted by water activated by fusion neutrons. United States: N. p., 1996. Web.
Smith, D L, Ikeda, Yujiro, & Uno, Yoshitomo. Radiography apparatus using gamma rays emitted by water activated by fusion neutrons. United States.
Smith, D L, Ikeda, Yujiro, and Uno, Yoshitomo. Tue . "Radiography apparatus using gamma rays emitted by water activated by fusion neutrons". United States.
@article{osti_392645,
title = {Radiography apparatus using gamma rays emitted by water activated by fusion neutrons},
author = {Smith, D L and Ikeda, Yujiro and Uno, Yoshitomo},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {11}
}