title: Sources of carbon which decrease the specific activity of [11C]CH3I synthesized by the single pass I2 method.
abstract: The sources of carbon, which decrease the specific activity of [11C]Methyl iodide [11C]CH3I synthesized by the single pass I2 method were, determined. Some organic solvents (acetone, CH3OH and THF etc.) and non-volatile oils (silicone oil and paraffin) could react with the I2 vapor to yield the non-radioactive CH3I in the heated quartz tube, which decreased the specific activity of [11C]CH3I significantly.
authors.affiliation: Department of Medical Imaging, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.
authors.forename: Ming-Rong
authors.initials: MR
authors.lastname: Zhang
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Suzuki