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Indirect effects:
Interaction of photons or electrons with water molecules.
Result:
Formation of radicals
H2O H2O+ +
e-
Hydroxyl radical:
H2O+ H2O H3O+ + OH-
Solvated electrons:
e- + [H20+] e-aqu.
Hydroxyl radical:
e-aqu. + H2O OH-
Hydrogen peroxide:
OH- + OH- H2O2
Radiolysis of water !
h
ν
Effect of Ionizing Radiation on Biomolecules