Correlation and competition effects in radical attack

The complexity of radiation damage arises from the spatial structure of the radiation track, which can lead to clustering of radical attack sites as well as clustering of direct damage. Normal chemical kinetics is not capable of describing multiple hits on the same molecule, nor their spatial distribution. This paper presents a new formulation of the kinetics, which describes both effects accurately in simple model systems. The formulation is validated by comparison with random flights simulations. Spatially non-additive effects on the competition between sites in a single target molecule are also analysed and simulated