γ-Radiation induced isotope exchange in the carbon monoxide-carbon dioxide system. Studies in silica vessels
Abstract
The behaviour of the isotopes 13C, 14C and 18O in the CO—CO2 system in silica vessels has been studied, and the usefulness of the system as a radiation dosimeter investigated. Each insotope has been employed under identical conditions. For the exchange of an oxygen atom between CO and CO2 the established G-value of 4.2 has been confirmed. Apparent anomalies between results involving carbon- and oxygen-isotope labelling have been explained by a schematic initial reaction scheme involving participation of the silica: [graphic omitted] (1), (18O)+ C16O→C16O18O (2), [graphic omitted] (3a), (C18O +16O)ads.Si16O18O→Si16O18O + C18O +(16O)(3b), (16O)+ C16O→C16O16O (4), (16O)+ C18O→C16O18O (5).