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Profile of Stray Radiation For Wallstand
The diagram below, Fig. 2-6, shows the dependency of the scattered radiation on the
distance from the central beam, height above the floor and kV potential. The decrease of the
scattered radiation is expressed in percent of the central beam exposure rate (100%). The
diagram also shows the decrease of scattered radiation when using protective clothing, also
this expressed in percent of the central beam dose rate.
Fig. 2-6 shows that a higher kV increases the scattered radiation slightly. The diagram also
shows that the best way to minimize the effect of the scattered radiation is with an increased
distance to the patient and by using a lead apron.
Central beam exposure parameters:
KVP: 70, 100, 120 kV
Tube current: 100 mA
Exposure time: 100 ms
Field size: 40x40 cm
Film-Focus distance: 1,5 m
Patient simulation: 150 mm PMMA
Filter: 0 mm
Central beam dose rate measured on top of PMMA (1250 mm from focus)
Fig. 2-6 Scattered radiation rate expressed in percent of central beam dose rate, with and without
Operator´s Manual
Scattered radiation expressed in percent of central beam dose rate
100,00
10,00
70KV, 500 mm
100KV, 500mm
120KV, 500mm
1000-095-071-EN Rev. 2.1
Radiation and X-Ray Tube
1,00
70KV, 1000mm
100KV, 1000mm
120KV, 1000mm
central Beam dose rate
shielding
Page 27
Safety
Height above oor(mm)
2000
1500
1000
500
0
0,10
0,01
Percent of central beam dose rate (%)
70KV, 1000mm, Lead apron
100KV, 1000mm, Lead apron
120KV, 1000mm, Lead apron
OMNERA 500A
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