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Production of [13N]ammonia applicable to low energy accelerators

Authors
Publisher
Elsevier Inc.
Publication Date
Volume
21
Issue
7
Identifiers
DOI: 10.1016/0969-8051(94)90089-2
Disciplines
  • Chemistry

Abstract

Abstract We have developed a technique for the rapid conversion of the nitrogen-13 induced in a graphite target into nitrogen oxides. This was accomplished by heating the graphite target in a stream of pure oxygen at 800 °C. Less than 20% of the radioactivity was found in the form of [ 13N]nitrogen. The rest of the radioactivity was efficiently trapped in a solid-phase medium that consisted of an aqueous solution of 5% NaOH dispersed in silica gel. The radioactivity from this solid-phase medium was eluted with water (94% recovery) and found to be in the form of 13NO 2 − (99%). This was subsequently converted to [ 13N]ammonia with Raney-nickel, either by a conventional liquid-phase reduction with an overall conversion efficiency to ammonia of 45%, or by an incorporation of the Raney-nickel into the solid-phase medium. The latter system resulted in an overall conversion efficiency to ammonia of 37 ± 9%, with a radiochemical purity of nearly 100% and a synthesis time under 17 min.

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