Discovery QDR Series Technical Manual
3-60
3.5.5.3 Initial Leakage Survey
1. Turn on X-rays by pressing the
<F1>
key.
2. 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.
3. If a leak is detected (a spike in the reading), measure a point at a one meter
(approx. 40”) distance from the leak and insure that the reading is 10µGy/h
(1.0mrad/h) or less.
3.5.5.4 Final Leakage Survey
1. Position the survey meter one meter (approx. 40”) from the tank and move it all
around the outside of the instrument.
2. The reading must be 10
µ
Gy/h (1.0mrad/h) or less. Record the highest reading in
the service report.
3. Press the
<F2>
key to turn off X-rays, remove the tool, and replace the tank
cover.
Note: Enter this information into the Radiation Measurement Report (see example on
page 3-70).
3.5.6 Calibrate For Area, BMD And BMC
Calibration for Area, BMD, and BMC is accomplished in 3 stages:
a.
Array Scan Thickness Measurement & Calibration
b.
Calibration of Area and BMC for Array Scan Modes
c.
Adding Array AP scans to the QC database
Follow the procedure, in order, and exactly as shown, for each stage of the calibration.
Note: If the Discovery being installed is to replace an existing QDR pencil beam or
hybrid pencil/fan beam system, then a cross-calibration must first be performed to
ensure that any longitudinal studies begun on the QDR being removed can safely
be continued on the new Discovery. Perform the cross-calibration before de-
installing the existing QDR. (Refer to QDR 1000-4500 Upgrade Procedure, 080-
0767 for complete instructions.)
Note: If this customer site includes two or more fan beam systems or if this Discovery is
replacing an older fan beam system (model QDR 4500 or Delphi), perform the
cross calibration procedure contained in Technical Bulletin TB-00123 before de-
installing the older system.To ensure stability, the instrument must be completely
powered up for a minimum of 30 minutes prior to running any of the following
WARNING:
X-rays are generated during this procedure. Keep hands, head and other body parts out
of beam.
WARNING:
X-rays are generated during this procedure. Keep hands, head and other body parts out
of beam.
Summary of Contents for DISCOVERY A
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