The shoe fitting fluoroscope was a common fixture in shoe stores during the 1930s, 1940s and 1950s.
A typical unit, like the Adrian machine shown here, consisted of a vertical wooden cabinet with
an opening near the bottom into which the feet were placed.
When you looked through one of the three viewing ports on the top of the cabinet
(e.g., one for the child being fitted, one for the child's parent, and the third for the shoe
salesman or saleswoman), you would see a fluorescent image of the bones of the
feet and the outline of the shoes.
According to Williams (1949), the machines generally employed a 50 kv x-ray tube operating at 3 to 8 milliamps.
When you put your feet in a shoe fitting fluoroscope, you were effectively standing on top of the x-ray tube.
The only “shielding” between your feet and the tube was a one mm thick aluminum filter.
Some units allowed the operator to select one of three different intensities:
the highest intensity for men, the middle one for women and the lowest for children.
Most units also had a push button timer that could be set to a desired exposure time, e.g., 5 to 45 seconds.
The most common setting was 20 seconds.
източник
http://www.orau.org/ptp/collection/shoe ... r/shoe.htm[/url]
