Word: medwedeff
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...Fred M. Medwedeff and Dr. William H. Knox of Nashville want even more safety than that. It is ridiculous, they say, to fire X rays at so big a circle when the target is a rectangle only 1 in. by 1½ in. To keep the X rays from fanning out, they must be "collimated"-made to follow parallel paths. In their machine, the Nashville dentists use a stainless-steel plate with a rectangular window to accomplish collimation; they also use much more shielding and a steel bracket to hold the film just where it ought to be, without subjecting...
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