QDR
®
4500 Technical Manual
3-26
2.
Go to the SUSQ program in the MENU directory; set X-ray mode to 3, and aperture
to 7.
Initial Leakage Survey
3.
Turn on X-rays.
4.
Slowly move the meter probe (Victoreen Model 450P or equivalent) about all accessible
surfaces. (See table above for meter response times) to detect any leaks.
5.
If a leak is detected (a spike in the reading) measure the that point at a one meter
(approx. 40”) distance from the leak and assure that the reading is 10
µ
Gy/h (1.0mrad/h)
or less.
Final Leakage Survey
6.
Position the survey meter one meter (approx. 40”) from the tank and move it all around
the outside.
7.
The reading must be 10
µ
Gy/h (1.0mrad/h) or less. Record the highest reading in the
service report.
8.
Turn off X-rays, remove the tool and replace the tank cover.
Note:
Enter this information into
The Radiation Measurement Report
(see page 3-28).
CALIBRATE FOR AREA, BMD AND BMC
The final calibration procedure is to calibrate for Area, BMD and BMC. Perform the
Area, BMD
and BMC Calibration
procedure in the
ALIGNMENT AND CALIBRATION
section of this
manual.
TEST SCAN MODES
Perform at least one scan in each of the scan modes to verify that machine is fully functional in
all modes of operation. Verify that there are no electrical or mechanical problems during each
scan mode.
1.
Perform a fast AP, turbo AP and a high definition AP scan.
2.
Perform an array left hip, and an array right hip scan.
3.
Perform a high definition lateral spine scan.
4.
Perform a whole body scan.
5.
Perform an array forearm scan (if option loaded).
FINISH ASSEMBLING UNIT
Dress all cables at the rear of the console with nylon tie wraps. At this point, take the time to
replace any covers or enclosures that may not have been reassembled previously. Check that all
of the machine's safety features (ground wires, limit switches, emergency stop, etc.) are in place
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