TY - JOUR

T1 - Exploring the mesoscopic structure of radiation track

T2 - The magnetic field effect in the radiation-induced fluorescence in the presence of an external electric field

AU - Borovkov, V. I.

N1 - Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/11/1

Y1 - 2018/11/1

N2 - A novel approach to probe the spatial structure of not-too-dense radiation track in condensed matter on the scale that, on the one hand, substantially exceeds the mean size of a single spur (<10 nm), and, on the other hand, is less than a characteristic size of the whole track, produced by a single electron of an energy of ~10 keV in an organic media (several microns), is suggested. Such an approach is based on the analysis of the joint effects of both external magnetic field, which allows obtaining information about intraspur recombination, and the external electric field, which increases the probability of the encounter of ions from neighbouring spurs, on the radiation-induced fluorescence from an irradiated medium. 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.

AB - A novel approach to probe the spatial structure of not-too-dense radiation track in condensed matter on the scale that, on the one hand, substantially exceeds the mean size of a single spur (<10 nm), and, on the other hand, is less than a characteristic size of the whole track, produced by a single electron of an energy of ~10 keV in an organic media (several microns), is suggested. Such an approach is based on the analysis of the joint effects of both external magnetic field, which allows obtaining information about intraspur recombination, and the external electric field, which increases the probability of the encounter of ions from neighbouring spurs, on the radiation-induced fluorescence from an irradiated medium. 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.

KW - Local ionization density

KW - Recombination fluorescence

KW - Spin-correlated radical pair

KW - Spin-lattice relaxation

KW - Stochastic computer simulation

KW - ALKANE SOLUTIONS

KW - AQUEOUS-SOLUTIONS

KW - SPUR OVERLAP

KW - RECOMBINATION FLUORESCENCE

KW - GAMMA-RADIOLYSIS

KW - NONPOLAR LIQUIDS

KW - DELAYED FLUORESCENCE

KW - FREE-ION YIELDS

KW - COMPUTER-SIMULATION

KW - MONTE-CARLO-SIMULATION

UR - http://www.scopus.com/inward/record.url?scp=85052121693&partnerID=8YFLogxK

U2 - 10.1016/j.radphyschem.2018.08.014

DO - 10.1016/j.radphyschem.2018.08.014

M3 - Article

AN - SCOPUS:85052121693

VL - 152

SP - 114

EP - 124

JO - Radiation Physics and Chemistry

JF - Radiation Physics and Chemistry

SN - 0969-806X

ER -