Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1993-06-04
1995-11-21
Mai, Ngoclan
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
423 2, 376195, 376201, 20415721, B01D 500
Patent
active
054683556
ABSTRACT:
A target is bombarded with high energy particles to generate a radioisotope, and the radioisotope is preferably extracted by one of the following: combusting the target in oxygen, stopping the bombardment and heating the target, or heating the target by induction. Bombardment may take place through a windowless path, and the radioisotope may be used for PET. The particles used may be deuterons or protons, and .sup.13 N may be generated. .sup.11 C may also be generated from either .sup.11 B or .sup.10 B using protons or deuterons. Combustion may be performed by induction heating and may be controlled by the quantity of oxygen available or the temperature. Combustion may be primarily confined to a surface layer and the target may be reused. The beam energy may be 2.2 MeV or less. Another general aspect includes trapping the oxides of .sup.13 N in a trap. The oxides may be converted into .sup.13 N-Ammonia, and this conversion may take place in the trap, which trap may comprise silica gel and sodium hydroxide and may also contain a reducing agent such as Raney-Nickel.
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Dence Carmen S.
Hughey Barbara J.
Klinkowstein Robert E.
Shefer Ruth E.
Welch Michael J.
Mai Ngoclan
Science Research Laboratory
Washington University
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