11
10
Scatter
As discussed in
Section 2.1 Radiation Safety
,
the transparent shield on the KaVo NOMAD
PRO 2 collimator, when properly oriented, acts as a barrier against backscatter radiation,
making it safe for the operator to stay in the room.
The significant zone of occupancy for operators has been further verified by internal
testing. A KaVo NOMAD PRO 2 device was remotely fired into a water phantom
repeatedly, with an ion chamber recording radiation readings at 336 points in the room,
first to establish the vertical significant zone of occupancy and then to establish the
horizontal significant zone of occupancy. Each exposure was taken at 1.00 seconds in
order to simulate “worse case scenario” results. The vertical significant zone of occupancy
measures 60 cm X 200 cm, while the horizontal significant zone of occupancy is 60 cm X
60 cm. A calibrated survey dosemeter can be used in order to confirm scatter radiation
data shown in the following diagrams.
For further information on these tests, please contact KaVo.
Vertical Plane,
Significant Zone of Occupancy:
60 cm x 200 cm
Horizontal Plane,
Significant Zone of Occupancy:
60 cm x 60 cm
