X Ray Tube Troubleshoot - Silicon Valley Gazette

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If you receive an X-ray tube troubleshooting error code, this user guide will help you. A common problem with realistic life tubes is sparking. The vast majority of proven causes of arcing are: excessive residual gas pressure, deterioration of insulation and consequent unwanted electron emission (commonly referred to as “field emission”). The first two questions have already been answered.

Error Analysis On X-ray Tubes

What are the main issues that cause faulty radiologic images?

Key results include poor handling, film fogging (including diffuse radiation), and a poor choice of influencing factors to consider. This is the most common cause of poor contrast. Underdevelopment results in x-rays that are generally too bright.

First, you need to analyze the cause of the malfunction, the error phenomenon and the cause, and then proceed to troubleshoot the X-ray tube

1. Thread breaks

1) Error phenomenon

2) Reason

Strong vibration of the X-ray tube breaks the filament;

The filament oxidizes after assembly due to air getting inside your current X-ray tube, which likely burned the filament. x-ray

The tube becomes thin only due to evaporation during prolonged use, so the amount of X-ray radiation should be reduced. To keep the power level of the engine constant, the voltage had to be increased, which destroyed the filament downwards.

Shorting a transformer or filament will often cause the filament to burn out.

2. Anode focus target damaged on surface

Image legibility is degraded by absorption typically associated with x-rays and x-rays in the wrong path caused by midplane irregularities or metal powder spatter. At this time, when the filament is heated, the brightness of this filament is darker than usual.

Mainly due to overuse and as a resultIf there is not enough time to cool the X-ray tube, the heat in the focal plane gradually builds up and then exceeds the maximum limit, which leads to partial melting or evaporation of the focal plane.< /p>

3. Downward vacuum i.e. leak or air intake

If you reduce the vacuum a little, when the voltage is connected, the small blue glow in the tube will not be good, the penetration efficiency will be insufficient.

When there is a sudden drop in vacuum at the voltage terminal, there is a distinct faint green glow, or a faint yellow glow, or a blue-violet glow in the tube, and you see that the milliammeter reads abnormally.

A full intake should break the vacuum in the tube. When a high voltage is connected, a significant breakdown will be detected between the discharge of two or more electrodes.

The rotating anode will overheat due to overload or poor heat dissipation, which will cause the new anode copper column and translucent glass welding site to expand, resulting in pair intake rupture;

Strong and extra vibration during transport or use may break the beautiful glass tube.

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The working environment was bad – sometimes hot, sometimes cold, which is what causes air to enter the vacuum of space.

4. Fluorescence towards the lamp

Blue or blue-violet fluorescence also appears in the main tube when the power is turned on.

A longer wavelength fluorescent beam is generated after a few low energy scattered electrons attack the window wall. The higher the tube current, the more obvious the fluorescence will be. On the contrary, if the fluorescence intensity decreases during lactation, then this is likely to be the reason for the increase in the energy of scattered electrons and the emission of the tube wall. When the existing tube is increased to a certain value, this special fluorescence caused by the bulb material disappears and does not affect the use of the X-ray tube. However, this excellent situation must be distinguished from the vacuum of this skid.ki.

5. Rotating anode does not rotate

There are two cases: first, there is usually no reaction when the spinner’s anode is triggered; The other is that when the anode rotates, 1 unusual noise occurs.

What causes xray tube arcing?

Arcing in the tube occurs when there is a short circuit in the tube, usually from this cathode to the body of the tube. Bypass represents a temporary loss of the final radiographic result and a localized artifact.

In addition to the failure of the rotating anode when the circuit is energized, this phenomenon can also be caused by axial deformation of the anode rotor assembly in the tube, or increased rotor friction, or excessive rotor advantage, or excruciating wear of the anode bearing.

x-ray

Common types of pipe failures

AN-02

X-ray tubes can be a proven and inexpensive way to deliver x-rays in medical, inspection or scientific applications. Over the past 100 years, X-ray tubes have evolved through various applications, processing materials, equipment and designs. Two types of lamps predominate today: rotating anode lamps, used mainly in medical applications, from 25 kilovolts (kV) to 150 kV, and stationary anode tubes, used in the experimental industry, from 25 kV to more than 300 kV,some in millions of voltage ranges. . Fixed anode lamps typically run at 1-20 milliamps almost continuously and can therefore run for many hours. Rotating anode lamps operate at an internal current of more than 1000 milliamps, but are mainly used in pulsed mode from 1 millisecond to 10 seconds.

During X-ray growth, less than 1% of its energy is converted into useful X-rays, and 99% of the energy is converted into heat. This limits the lifetime of the x-ray tube. Many scientific disciplines had to be mastered to produce a great product. These include: thermodynamics, heat transfer, building materials, vacuum technology, high voltage, electronics, atomic/radiation disciplines, manufacturing processes and less important technologies. The integration and control associated with the X-ray tube and generator is important to achieve the expected technical results and extend the life of the tube.

a) Normal filament burnout
b) Accelerated filament burnout
c) SlowLeaks
d) inaction
e) broken glass
f) arching
g) targeted microcracking
h) Accidental damage
i) Warehouse

a) Immediate errors
i) Sort by testing
ii) Holding period
iii) Unsuitable materials
iv) processing error
b) Hidden errors
i) Process optimization
ii) Marginal/misunderstood processes
iii) Error/Unexplained Cause Analysis

a) supply impedance
b) AC/DC filament
c) high frequency
d) speed/brake
e) thread reinforcement
f) logic circuits
g) Thread limit/Thread preheat settings

a) Dielectric leakage (oil)
b) Overheating
c) Ambient temperature
d) Household behavior
e) Cable/Ground connections
f) Requirements for dielectric expansion
g) Judicial discipline

Old age and X-ray tubes also have a limited lifespan as the ingredients and materials used gradually deteriorate and wear out, so performance is gradually reduced until more satisfactory.

a. Normal-Filament-Burn-Out: The electron beam in an X-ray tube is always delivered by a tungsten filament, which always contains electrons. in incandescent lamps. Despite experiments with other emitters: auxiliary cathodes, lanthanum and cerium hexaboride, with tungsten doped with thorium and then rhenium, pure tungsten remains the highest quality filament material. The filament consists of a wire wound in a spiral and inserted into a bowl that acts as a focusing element to provide the required rectangular imaging of the electron beam. The filament serves to reinforce the filament and provides an increased surface area that maximizes electron emission.