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x-ray tube

and anode function

QuestionAnswer
What is a typical support system used in Radiography? Typical support systems include ceiling support systems, self-standing support systems, and floor-to-ceiling support systems.
What is the purpose of the protective housing of an x-ray tube? The protective housing is designed to control scatter radiation and reduce the hazard of leakage radiation.
What does isotropically emitted x-rays mean? It means that x-rays are emitted in all directions.
What is radiation that leaves the x-ray tube at areas other than the window called? It is referred to as leakage radiation.
What was the original x-ray tube called? The original x-ray tube was called a Crookes tube.
What is the modern x-ray tube called? The modern x-ray tube is called a Coolidge tube.
What is the negative side of the x-ray tube? The negative side of the x-ray tube is the cathode.
What is thermionic emission? Thermionic emission occurs when the filament is heated and outer shell electrons are boiled off.
What is the coil of wire that is the source of burned off electrons? The coil of wire is called the filament.
What is the purpose of the focusing cup? The purpose of the focusing cup is to focus electrons toward the anode.
How is filament current measured? Filament current is measured in amps or milliamps.
What is the range of filament currents? Filament currents are typically in the range of 3-6 amps.
What do boiled off electrons form? They form a cloud referred to as a space charge.
How many focal spots do most x-ray tubes have? Most x-ray tubes have 2 focal spots.
What are x-ray tubes enclosed in? X-ray tubes are enclosed in glass or metal enclosures.
What is the maximum allowable leakage radiation? Leakage radiation must not exceed 1 mGy/hr at 1 meter when operated at maximum conditions.
Which of the following doesn't pertain to the cathode? The cathode is negatively charged, has a focusing cup, and a filament, but is not positively charged.
What is an x-ray tube with 2 focal spots called? An x-ray tube with 2 focal spots is called a dual focus tube.
What is the filament made out of? The filament is typically made out of tungsten.
What is the melting point of tungsten in °C? The melting point of tungsten is 3410°C.
What is NOT a type of anode? A vibrating anode is NOT a common type of anode.
What is NOT a function of the anode? The anode does not serve as a source of x-rays.
During x-ray production, what percentage is heat and what percentage is x-rays? Approximately 99% is heat and 1% is x-rays.
What is the target in a stationary anode? The target in a stationary anode is typically a tungsten-rhenium alloy.
What is the target in a rotating anode? The target in a rotating anode is also typically a tungsten-rhenium alloy.
What controls anode rotation? Anode rotation is controlled by an electric motor.
What is the actual area on the target where x-rays are emitted? The actual area is called the focal spot.
What principle states that the effective area of the target is smaller than the actual area? This is known as the line focus principle.
What is the shaft made of copper and soft iron inside the tube called? This shaft is called the rotor.
What is the typical shape of the effective focal spot? The effective focal spot is usually characterized by a double banana shape.
What states that radiation intensity is greater on the cathode side of the x-ray field? This is known as the anode heel effect.
What occurs when electrons interact with the target somewhere other than the focal spot? This is referred to as off focus radiation.
Created by: user-2019507
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