X-Ray Fitting Time Limited Potential health hazards from the use of x-ray shoe Atting devices were explained recently in a letter from the Ohio State Department of Health. When several pairs of shoes are tried on, the total exposure may be excessive, according to board of: health officials. Authorities agree that the total exposure time for any one customer in any one day should not exceed 25 seconds and a yearly total not to exceed 100 second or 20 five second fittings.