Abstract

Nucleation of superheated droplet and subsequent vapour oscillation produces an acoustic pulse that contains important information about the bubble nucleation process. The high frequency acoustic pulses during the bubble nucleation of R-134a liquid droplets have been observed in the frequency range of few kHz to MHz by irradiating with neutrons and gamma rays. The spectral analysis of the gamma ray induced signals indicates the existence of several frequency components, which are not present for the neutron induced signals. Acoustic power, duration and number of peaks of the signals have also been studied which show a significant discrimination between the neutron and gamma ray induced events.

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