Predicted radiolysis yield in a Fricke solution irradiated with various heavy ions

Experimental data on the spatial distribution of the energy deposited aroun d an energetic heavy ion, from 1 MeV proton to 5.9 MeV/n uranium ion, which have been reported in the literature were documented to obtain a scaled ra dial dose distribution; (beta/Z*)(2) D(Z*, beta,t) = 200 (for t = 0-1), 200 /t(2) (for t = 1 similar to t(c)), and 200 t(c)/t(3) (for t > t(c)) where Z * and beta are the effective charge and velocity relative to c, the velocit y of light, of the incident ion, respectively, D the dose in unit of Gy, t the radial distance in unit of nm, t(c) the critical distance empirically d etermined. Then, if we know the yield of any chemical reaction as a function of dose f rom the results of experiments using gamma-radiations or fast electrons or theoretical calculations, we can calculate the probability for the yield of the chemical reaction in the system bombarded with a heavy ion of the effe ctive charge Z* and velocity beta. The results of the present calculation o f the LET-values and of G(Fe3+) in the ferrous sulfate acidic solution are presented and compared with reported experimental results. (C) 1999 Elsevie r Science Ltd. All rights reserved.