Finite size of focal spot is critical factor in radiography and fluoroscopy; modern techniques place greater emphasis on reduced focal spot size; pinhole imaging of X-ray focal spots over wide range of voltage; variations in pinhole size, density, and magnification appear minor compared to inaccuracy of direct visual measurement of blurred focal images; Klastens' method of film trace evaluation of blurred contours is applied to images of known sources and is shown to reflect more realistic value than that obtained through direct visual measurement.
X-ray focal spot measurement
Nondestructive Testing
Non-Destructive Testing ; 12 , n 1
1954
4 pages
Article (Journal)
English
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