Radiography Quiz 1 2
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- Define: Electromagnetic radiation
- a form of energy that travels thru space as a wavelength and frequency.
- What is an atom?
-
Smallest unit of life.
Consists of protons, neutrons, and electrons. -
True or False:
The cathode is positively charged. - false
- Where are the electrons released from on the x-ray?
- The negatively charged cathode.
- What percent is heat that is created from excited electrons?
- 99%
- What does the glass envelope do for the x-ray machine?
- creates a vacuum environment to produce an x-ray.
- What is the coiled filament called on the cathode?
- tungsten wire
- How many filaments are found in a modern radiograph unit?
- 2
- What is the amount of energy created in the cathode called?
- milliamperage (mA)
- What is the acceleration of electrons from the cathode to the anode controlled by?
- kilovoltage
- What is the base of the target of the anode made out of?
- copper
- How much milliamperage is the rotating anode capable of outputting?
- 100-300 mA
- What does a small focal spot result in?
- Strong x-ray beam toward the cathode side, great reduction of the intensity of the x-ray beam towards the anode side.
- Define: Heel effect
- The heel effect is the variation of the x-ray beam. The smaller the anode angle, the greater the heel effect.
- Define: Kilovoltage
-
KV= 1,000 volts
amount of electrical energy applied so that the electrons accelerate from the cathode towards the anode.