Temperature dependence of oxidative particle yield during liguid water radiolysis

It is established that under radiolysis of 5x10-5-4x10-3 mol/l K2Cr2O7 solutions saturated with air in the 0.05-0.4 mol/l sulphuric acid reduction yield of Cr2O72- ions equals G=G0+1/3ΔG(H2), where G0=0.384 is the reduction yield in infinite dilution: ΔG(H2) is the difference between the initial H2 yield and the yield under radiolysis of the solution with the prescribed concentration. G=G20deg(1.025-1.375x10-3xt) at 0 ≤ t ≤ 250 deg C. Temperature dependences of OH and H2O2 yields are calculated. OH radical yields grow monotonously from 2.95 to 5.11 and hydrogen peroxide yield decreases linearly from 0.80 to 0.61 when temperature (t) changing from 20 to 250 deg C. It is shown that using the acid solution of potassium bichromate as a dosimeter, one should take G=0.395 ± 0.28 only at [K2Cr2O7] ≤ 10-3 mol/l and at temperatures up to 90 deg C