Why is an x-ray tube immersed in oil?
To expedite cooling and to insulate the tube, it is immersed in oil to ensure that it is electrically insulated and so that the oil will also help cool down the tube during operation.
How is the x-ray tube cooled?
The cooling system includes a reservoir containing a volume of coolant in which a portion of the x-ray tube is immersed. An external cooling unit directs a flow of coolant through a pressure drop device proximate to the x-ray tube so that the flowing coolant removes heat from the x-ray tube.
How does surrounding the x-ray tube with oil help cool it?
First, the housing is filled with an oil to help dissipate heat. This oil helps to draw heat away from the tube and cool it off during use. Second, the housing is equipped with cooling fans. These fans circulate air around the tube to also expedite its cooling.
Why is there a cooling system in x-ray tube?
Medical imaging systems require conflicting requirements of increased heat pumping performance with lower power consumption. As a result, liquid cooling systems are often the preferred choice to move heat away from the X-ray tube to ensure quality images are produced.
Why is it necessary to have oil cooling the anode?
The heat capacity of the focal spot track is generally the limiting factor for single exposures. In a series of radiographic exposures, CT scanning, or fluoroscopy, the build-up of heat in the anode can become significant. Excessive anode temperature can crack or warp the anode disc.
What is x-ray tube explain?
X-ray tube, also called Roentgen tube, evacuated electron tube that produces X rays by accelerating electrons to a high velocity with a high-voltage field and causing them to collide with a target, the anode plate. Only about 1 percent of the electron energy is converted to X rays.
What is the purpose of an anode cooling chart?
The anode cooling chart shows how long it takes the tube to cool from its maximum level of heat. An AC motor consisting of a rotor and stator. The electromagnets in the stator have a changing magnetic field that causes the rotor within to turn.
What are types of X-ray tube?
There are two basic types of microfocus X-ray tubes: solid-anode tubes and metal-jet-anode tubes. Solid-anode microfocus X-ray tubes are in principle very similar to the Coolidge tube, but with the important distinction that care has been taken to be able to focus the electron beam into a very small spot on the anode.
What is molybdenum in xray?
molybdenum metal is a key component of the anodes in some x-ray tubes, especially in mammography. molybdenum generators (Mo-99/Tc-99m) are important as a source for technetium (Tc-99m)
What is the K edge in mammography?
The K-absorption edge (K-edge) refers to the abrupt increase in the photoelectric absorption of x-ray photons observed at an energy level just beyond the binding energy of the k-shell electrons of the absorbing atom.
What is modern xray tube?
The device used to produce X-rays is called an X-ray tube. These electrons are stopped by the target and in the process X-rays are emitted. These X-rays are brought out of the tube through a window made of thin mica or mylar or some such material which does not absorb X-rays appreciably.
Is there an oil cooler for X-ray tubes?
The OL4503 is a closed circuit 4.5kW oil cooler designed to cool bipolar x-ray tubes. The oil is cooled by an air cooled heat exchanger, while oil pressure is limited by an adjustable bypass valve.
What happens if the temperature in an X ray tube is too high?
This places a limitation on the use of x-ray apparatus. If excessive heat is produced in the x-ray tube, the temperature will rise above critical values, and the tube can be damaged.
Why was the specialheat unit added to the X-ray tube?
Although the joule is the basic unit for energy and heat, it is not always used to express x-ray tube heat. The specialheat unit (HU)was introduced when single-phase equipment was common to make it easy to calculate heat. The relationship between a quantity of heat expressed in heat units and in joules is given by
How does the rotation of the X-ray tube work?
Rotation “spreads” the build-up of heat along the entire disc rather than just one given spot. The specific spot along the track where the electron stream strikes is called the “focal spot” or tube focus. The focal spot settings available are “large” and “small”.