Operator Manual / 2. Safety
26
2.8 X-ray generation principles
X-rays in VOTI X-ray scanners are produced in an X-ray generator. Inside the generator is a vacuum tube containing a
tungsten filament cathode, and an anode that is also made of tungsten. A current is passed through the cathode,
causing it to heat up and emit electrons. Voltage is applied across the cathode and anode, which causes the electrons
to accelerate towards the anode. When the electrons strike the anode, their kinetic energy is absorbed, and some of it
is released again in the form of X-rays. A rough diagram of the apparatus is as follows:
Figure 5 - X-Ray Generation Operating Principle
The value of the voltage applied determines the energy of the X-rays produced. In the case of a VOTI scanner, this
voltage is usually 160 kV. The current passing through the cathode determines the quantity of X-ray photons
produced. The cathode current in a VOTI scanner is usually between 550 µA and 1 mA.
The X-ray generator is shielded to prevent radiation from escaping, except through a funnel that directs X-rays
towards the tunnel of the scanner. The funnel and the tunnel of the item scanner are also lined to prevent X-rays
from escaping.
© VOTI 2020 / 900116-001
Summary of Contents for XR3D
Page 8: ...Operator Manual 1 Introduction 8 Model Image XR3D 50 XR3D 60S VOTI 2020 900116 001...
Page 9: ...Operator Manual 1 Introduction 9 Model Image XR3D 60 XR3D 6D VOTI 2020 900116 001...
Page 10: ...Operator Manual 1 Introduction 10 Model Image XR3D 7 XR3D 7D VOTI 2020 900116 001...
Page 11: ...Operator Manual 1 Introduction 11 Model Image XR3D 100 XR3D 100D VOTI 2020 900116 001...
Page 12: ...Operator Manual 1 Introduction 12 Model Image XR3D 100B XR3D 100BD VOTI 2020 900116 001...
Page 13: ...Operator Manual 1 Introduction 13 Model Image XR3D 15D XR3D 18D VOTI 2020 900116 001...
Page 116: ...Accident Investigation Report Appendix...
Page 118: ...VOTIDETECTION COM VOTI Detection 790 Begin St St Laurent QC H4M 2N5 Canada...
