Abstract
Human lymphocytes were exposed in vitro to therapeutic levels of ultrasound (1 W/cm 2, CW, 0.87 MHz, durations of 80 and 160 sec). There were no significant differences in sister-chromatid exchange frequencies between controls and ultrasound-exposed cells. Exposure of lymphocytes to the positive control (mitomycin C) resulted in a significant increase in sister-chromatid exchanges. The data do not verify a report by Stella et al. (Mutation Res., 138 (1984) 75–85) that such exposures result in increased frequencies of SCEs.
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