Exploring the mesoscopic structure of radiation track: The magnetic field effect in the radiation-induced fluorescence in the presence of an external electric field

The computer simulation of ion recombination in model tracks, which are to represent the real track formed by a single quantum of energy of about 20 keV in liquid dodecane and squalane, has been performed. It has been demonstrated that within the first microsecond after irradiation the ion recombination process in the studied alkane solutions can be represented using a set of 25-30 spherical spurs, which contain 3-4 primary ion pairs and have radii of 3-4 nm. Within the frameworks of the model used, the closest fit has been obtained assuming that in the model track the neighbouring spurs are located successively in random directions with a characteristic distance between them as large as 45 nm.