Track “Core” Effects in Heavy Ion Radiolysis

Authors

• Robert Katz, University of Nebraska-LincolnFollow
• Guo-Rong Huang, University of Nebraska-Lincoln

Document Type

Article

Date of this Version

January 1989

Comments

Published in Radiation Physics and Chemistry 33:4 (1989), pp. 345-349; formerly, International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry http://www.sciencedirect.com/science/journal/0969806X Copyright © 1989 Pergamon Press plc. Used by permission.

Abstract

By assuming that HO₂^● radical production in water and H₂ production in benzene are 2 hit processes, and applying the concepts of track physics, we are able to obtain a parametric fit to the yields of these reactions by heavy ion radiolysis from knowledge of the radial dose distribution about a heavy ion’s path. We make no use of the concept of a track core, for no clearly definable track core appears in our calculations of the radial dose distribution. Instead we calculate an action cross section σ from the assumed 2 hit response to γ-rays. The cross section is calculated from two fitted parameters, E₀, the γ-ray dose at which there is an average of 1 hit per target, and the target radius a₀. From the cross section, the target radius and the stopping power we calculate the G value. While our model is not mechanistic, the assumed 2 hit process is consistent with hypotheses which have been offered as chemical models for these processes. Since a 2 hit process is more likely to take place in a high dose region, close to an ion’s path, it may easily be attributed to a hypothetical track core in energy deposition, when indeed the response is a property of the detector.