Direct observation of the time dependence of the yield of e–aq produced in water by nanosecond pulses of 3 MeV protons is reported for the first time. From the effect of added hydroxide ion, G(e–aq) is estimated to be at least 3.6 at 10–11 s, falling to 2.3 at 10–9 s. The experimental measurements do not agree with predictions of the present diffusion model; modifications to improve the model are discussed.
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Burns et al. (1977) studied this question.
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