1110
NOMAD
Scatter
As discussed in Section 2.1 Radiation Safety, the transparent shield on the 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 NOMAD Pro 2 backscatter shield may
contain lead dependent on its date of manufacture to attenuate scatter radiation.
The significant zone of occupancy for operators has been further verified by internal
testing. A 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 for unit located 100 cm above the floor. 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 dosimeter can be used in order to
confirm radiation data shown in the following diagrams.
For further information on these tests, please contact Dental Imaging Technologies
Corporation
Scatter Results using Lead-Free Shield
Horizontal Plane,
Significant Zone of Occupancy:
60 cm x 60 cm
Vertical Plane,
Significant Zone of Occupancy:
60 cm x 200 cm
NOTE: Depictions of the user are for reference only.
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