Abstract
An experimental method was conducted to evaluate the minimum bubble nucleation energy of freon-12 for application in the superheated-liquid-droplet (SLD) technique. The minimum energy needed for an incident particle to cause the bubble nucleation is based on the theoretical calculation ofW min /ηkr c value. The calculated value may mislead the result of measured intensity due to its under/overestimation ofW min /ηkr c values at various temperatures. Nevertheless, the experimental evaluation ofW min /ηkr c of freon-12 for causing the bubble nucleation is barely touched because the proper methodology has not developed fully. The minimum energy needed to produce the bubble nucleation, can be evaluated by mixing the alpha-emitting nuclides with the SLD. By direct hitting the SLD with alpha-particle, the energy deposited inside the SLD may cause the bubble nucleation if the deposited energy is larger than theW min /ηkr c of freon-12 droplet at that specific temperature. The experimental evaluated values in this study agree with the theoretical estimation in 78% for SLD emulsion temperature within 22–34°C. Tests suggest that to apply the SLD in measuring the alpha-emitting nuclides, the emulsion temperature should be maintained below 30°C to get a maximum efficiency and to avoid interference from beta or gamma event.
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