No abstract

The new method described in this article allows the detection of low concentrations of radical species created in water for high linear energy transfer (LET) pulse radiolysis. The time-resolved chemiluminescence was used in a pulse radiolysis experiment at the Grand Acce ´le ´rateur d'Ions Lourds (Caen, France) with an 40 Ar 18+ ion beam for the determination of radical yields. In water, for an LET of 280 eV/nm, the yield of OH is 2.2 × 10 -8 mol/J. A minimum value of the e aqand HO 2 /O 2yields is obtained. These experimental G values are compared to those obtained for the same LET. They are in good agreement with the values in the literature. The sensitivity of the time-resolved chemiluminescence method allows the measurement of concentrations of radicals species as low as 2 × 10 -7 M.