Resonant absorption of high‐frequency sound was tried as a new method for the determination of bubble growth. In the 85‐cm bubble chamber at DESY, filled with a Ne/H2 mixture (90/10 mole%) at 29°K, the growth rate of subvisible bubbles was measured with 122‐kHz ultrasonics for time intervals between 10 and 70 μsec after the passage of a particle. The results were evaluated according to the theory of Trammell and were compared with an extrapolation from optically measured values under the assumption of an Rt1/2 dependence for the bubble radius.

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