Water radiolysis with heavy ions of energies up to 28 GeV, 1; Measurements of primary values as track segment yields

Yamashita, Shinichi; Katsumura, Yosuke; Lin, M.; Muroya, Yusa*; Miyazaki, Toyoaki*; Murakami, Takeshi*

Water radiolysis has been investigated with heavy ions having energies up to 28 GeV provided from the Heavy Ion Medical Accelerator in Chiba (HIMAC) at the National Institute of Radiological Sciences (NIRS). Beams of He, C, Ne, Si, Ar and Fe with respective energies of 150, 400, 400, 490, 500 and 500 MeV per u corresponding LET values of 2.2, 13, 30, 54, 92 and 183 eV per nm, respectively, were taken for the irradiation. The LET changes in sample solutions can be neglected due to their high energies for the irradiation of 1-cm cells. Primary values have been determined for three important products, hydrated electron (e), hydroxyl radical (OH), and hydrogen peroxide (HO) as track segment yields (differential yields) under the conditions of neutral pH.