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A NEW METHOD TO DETERMINE THE FOCAL SPOT SIZE OF X-RAY TUBES

GOPALA U. V. RAO SC.D.

A method to determine the focal spot size of x-ray tubes is described. The method is based on the observance of the critical magnification factor at which the contrast in a roentgenogram of a periodic barpattern of known spatial frequency reaches its minimum value before increasing again with a reversal of the bright and dark areas.


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