990400 Rev C 2010 May 1
Radiation Environment Survey
13-5
Conditions of Operation – PAN Scans
All data were acquired using 2 Technical Associates Mark V
integrating ion chamber meters. Measurements were made in
concentric circles of radii listed in the tables below. An AAPM head
phantom was placed in the beam to act as a scattering agent. The
center of the ion chamber was placed at the same height as the center
of the beam.
Locations listed in the table are for 0, 45, 90, 180, 225, 270 and 315
degrees. Looking out from the system, 0 degrees is directly in front.
The two calibrated integrating ion chambers were used
simultaneously to measure dose resulting from scatter at each
location. The integration time for each mode was the entire scan
time. The scatter phantom used was the AAPM head phantom used
for measuring patient dose. In each case the highest of the two
readings was used. In all cases, the readings were in good agreement
with each other.
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