22 Neutron Emissions from Hydrodynamic Cavitation 179 Fig. 22.4 Neutron emission results for test durations of 32 (a), 6 (b), 22 (c) and24 (d) hours. The alpha particle emissions for the last two test are reported (e, f). This kind of emissions can be compared to the neutron emissions acquired for the same tests than the background level. In Fig. 22.4b very similar results are shown in the case in which the neutron emissions is obtained by theHe3 proportional counter. The time duration of the experiments is equal to 6 h. In this particular case, after 2 h from the beginning of the experiment a neutron emission greater than the background level has been recognized. At the end of the experiments an emission of about two times the background level is observed. In Fig. 22.4c, d neutron emissions behaviour have been reported for two tests with a total duration of 22 and 24 h. In these two cases different impulsive emissions with an amplitude of about two times the background level may be observed. In the
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