Study of the nucleation in superheated emulsion detector at high pressure

The presence of second metastable state in the superheated emulsion detector has been reported earlier. The nucleation of the superheated droplets in a radiation field shows a proportional nature when the droplet depletion is negligible. However, the second metastable state has a much higher nucleation frequency and its population replenishes from the normal metastable state when there is a break in irradiation, and this causes the nucleation of the droplets not to be proportional to the dose delivered. It is observed that the droplets in the second metastable state decreases with increased temperature. The study of nucleation at high temperature and pressure, where the population of the droplets in the second metastable state is expected to be small, is presented here. (C) 2012 Elsevier B.V. All rights reserved.