✍ Scribed by Dr. Melvin R. Sikov; Percy Hildebrand
No coin nor oath required. For personal study only.
Individual nine‐day rat embryos were exposed for 5 or 15 minutes to graded intensities of well‐characterized focused beams of 3.2 MHz continuous wave ukrasound. Fetuses were examined for effects at 20 days of gestation. Analysis of the exposure‐response relationships indicates an “apparent threshold” for prenatal mortality at 3 W/cm^z^ (95 per cent fiducial limits 0.5‐6 W/cm^2^). Felal size was unaffected at any exposure level and there were only a few malformations, which occured at 10.5 W/cm^2^ and above.
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