Abstract
11C-acetylene is obtained by pyrolysis of methane in an inductive argon plasma. Methane is produced by bombardment of N 2H 2 mixture with 20 MeV protons. After irradiation, 11CH 4 is trapped in an active charcoal column (−195°C). This column is swept by an argon flow to drive off nitrogen. The column is heated at 250°C, the methane desorbs very quickly and is injected into the base of the plasma with argon. 60% of the methane is converted instantly into acetylene, 30% remains as CH 4. The acetylene obtained has a specific activity of 150 mCi/μM and a purity of 98%.
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