William Nelson Beck (1923-1996)
Xray pictures with sound waves? Argonne National Laboratory is demonstrating
it can be done, though the "pictures"
aren't yet of standard quality. W.N. Beck of Argonne's Metallurgy Division pioneered the technique when he needed
ultrasonic inspection of reactor fuel elements to detect discontinuities in the bond between the fuel and its cladding.
Then he turned the device on himself and showed that a usable "X-ray" of the hand could be made. Standard ultrasonic equipment is used, with two crystals - one to transmit, one to receive the vibrations. When one
scanner encounters a flaw in the fuel element (or a bone in the hand), reception is interupted and a white space appears
on the electrosensitive recording sheet (see photo).
Argonne National Lab Highlights: 1950-1959 (A.N.L. Official Website)
April 17 -- A short article by Argonne physicist W. Nelson Beck is received
Reprinted from The Journal of the Acoustical Society
of America, Vol. 29, No. 7, 865, July, 1957
Ultrasonic Recording of the Bones in a Human Arm
IN THE evaluation of an ultrasonic scanner and recording system, the effect of a transmission technique on human flesh at a frequency of 1 Mc was noted. By adjusting the sensitivity of the recording circuit it was possible to discriminate between flesh and bone. The figure on the left is a photograph of a recorded trace which indicates the location and the basic shape of bones in the hand and forearm. The two-dimensional figure is obtained by mechanically scanning an area with a small ultrasonic beam which transcribes a geometric "saw tooth". The recording is accomplished by a helix recorder which writes on electrosensitive paper. The scanner was developed primarily for the inspection of power reactor fuel elements, but this particular application might be of interest to other investigators.
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