9600 Service Manual - gmecorp-usa.com

Generator Calibration 35
10R VERIFICATION PROCESS
This is the process to ensure compliance with FDA requirements 80-8035, Section
1020.32, part D2.
1. In the MANUAL FLUORO mode, set the technique to 40 kV and 5.0 mA.
2. Center an ion chamber in the X-ray beam 12-inches (30 cm) above the II as shown
below.
Figure 9 - Dosimeter and Ion Chamber Set-up for 10R/Min Output
3. Next, increase the kV slowly up to 120 kV allowing the dosimeter to stabilize its
reading as kV increases. At no point should the Actual Dose Rate (See note
below) exceed 9.26 R/min.
NOTE: If you are using an open air ion chamber, the measured dose rate (MDR) read on the
dosimeter should be corrected for atmospheric pressure. This is know as the
Actual Dose Rate (ADR). Calculate the ADR using the following formula.
ADR = (760/P) (273.15 + T/295.15) * MDR
P = Absolute Pressure in Millimeters of Mercury
T = Temperature in degrees Celsius
4. If necessary, perform the 10R Entrance Exposure Calibration beginning on the next
page.