9600 Service Manual - gmecorp-usa.com

Generator Calibration 19
ENTRANCE EXPOSURE CALIBRATION
OVERVIEW
Entrance exposure is the amount of radiation available at the entrance point of patient
anatomy. Entrance exposure is measured 12" (or 30 cm) above the surface of the
Image Intensifier in the center of the X-ray beam. This measurement is used to
represent the average thickness of patient anatomy.
5R and 10R Systems
FDA requirement 80-8035, Section 1020.32, part D2 states the maximum FLUORO
entrance exposure is either 5R/min or 10R/min depending on the manufacturing date. If
a system was manufactured before May 19, 1995, the maximum entrance exposure
allowed is 5R/min. On or after May 19, 1995, the maximum entrance exposure allowed
is 10R/min. This impacts 9600s as indicated by the following system serial numbers:
• 5R systems = S/N 69-0001 to 69-1160
• 10R systems = S/N 69-1161 and higher
The remainder of this chapter is divided into two sections for both groups of system
serial numbers as described above. These two sections include theory and calibration
information.
NOTE: Be sure to refer to the correct Entrance Exposure documentation (5R or 10R)
contained within this chapter depending upon the serial number of your system.